建築構造の接合一般技術 (JP Patent Analysis Report)
The Theme Code "建築構造の接合一般技術" had 110 patent application filings in the most recent period (2023-01-01 to 2023-03-31). This is a slightly increased of +2 filings (1.9%) over 108 they had in the same period of the previous year (2022-01-01 to 2022-03-31).
The highest number of filings in 2019 with 387 cases, and their lowest number in 2014 with 273 cases.
The mean of the number of filings over the last 5 years (2018 to 2023, 1,940 cases in total) is 323, and the median is 344. The coefficient of variation (standard deviation/mean) is 0.20, and there have been small fluctuations in the number of filings from year to year.
| Index | Value |
|---|---|
| Average | 323 patents |
| Std Dev | 64.0 |
| COV | 0.20 |
The number of filings has been decreasing for the last 3 years (2020 to 2023).
| Year | Cases | YOY |
|---|---|---|
| 2022 year | 335 cases | -5.37 % |
| 2021 year | 354 cases | +18.00 % |
| 2020 year | 300 cases | -22.48 % |
This report provides the latest patent analysis information (the IP landscape, including a patent map) on the patent search results of the JP patent database for 建築構造の接合一般技術[2E125] for the period of the last 10 years (2014-01-01 to 2024-11-30). You can compare the information in this report with the trends in your competitors’ patent filings and technologies, and use it to search for important patents.
This service provides, free of charge, a patent analysis report based on the latest patent data (Japanese, U.S., European, and PCT application publications) for use in patent searches, patent analysis, and IP landscaping. The service is offered by "Patent Integration" a firm specializing in patent search/patent analysis.
This report includes basic information to help you understand the IP strategy and management of 建築構造の接合一般技術, such as changes in the number of patents/patent applications they have filed, comparisons of the numbers of patents/patent applications filed by their peers and competitors, their top coapplicants (joint research partners, alliance partners), and their most important patents. It can be used in various intellectual property business operations such as IP landscaping, patent search/patent analysis, preparation of intellectual property business evaluation reports, selection of M&A candidates, and selection of alliance partners.
- Table of Contents
- Foreign Patent Analysis Report
- Patent Filing Summary for 建築構造の接合一般技術
- Search Set (Search Formula/Analysis Patents)
- Related Patent Analysis Report
- Competitors Information
- Top company Information
- • Information on Important Patents
- Provision of patent information to the media
- About this Site
He is a patent attorney at a patent office. He specializes in invention counseling, patent filing, and intellectual property strategies for start-up companies and new businesses in the fields of software, information technology and artificial intelligence. He runs a patent course for beginners on Udemy, an online course provider.
After studying physics at the University of Tokyo as a doctoral student, he was engaged in intellectual property analysis and technology trend research as an in-house patent attorney at a precision equipment manufacturer and at Toyota Central R&D Labs. Inc..
Introduction
The concept of the "IP landscape" (IPL) has been attracting attention recently.
An IP landscape is not limited to patent information, but also integrates and analyzes business information (e.g., non-patent information such as papers, news releases, stock information, and market information). Intellectual-property-based business management is realized through the analysis of intellectual property information applied to the formulation of management strategies and business strategies. This is a comprehensive approach that includes but not limited to planning of open and closed strategies, selecting M&A candidates, searching for alliance partners, and formulating intellectual property strategies, through the exploitation of intellectual property information.
IP landscaping usually includes patent search and patent analysis. In patent search and patent analysis, it is important to grasp the market position of each company and the overall technological trends and development trends for each technology. More specifically, it is important to understand what intellectual property your own company and other companies hold, what the strengths and weaknesses of other companies are, and how other companies are trying to exploit their intellectual property. In other words, it is important to understand both the business strategy and the intellectual property strategy of each company.
After reading this search report, you may be interested in more detailed patent searches and patent analysis. We offer a service called Patent Integration, which is an integrated patent search and patent analysis service. With reasonable pricing and a simple user interface such that even beginners can quickly search for and analyze patent information by company or technology from a web browser, please consider using it for detailed patent searches, patent analysis, and IP landscaping.
Patent Integration has a patent-landscaping function that can visually represent a set of tens of thousands of patents/patent applications. This allows you to convincingly show the technical positions of your company and its competitors to your management and business strategists in order to formulate management strategies and business strategies.
建築構造の接合一般技術, Changes in the Number of JP Patents/Patent Applications
The changes in the number of patent filings of 建築構造の接合一般技術 over the last 20 years (JP) are shown below.
The change in the number of patents/patent applications is the most basic index in patent analysis. By examining the change in the number of patents/patent applications, you can see the status of technological development and R&D focus for each company or technology. It should be noted that since there is a one and a half year lag between the filing and the laying open of patent applications, it is not possible to analyze the situation more recently than one and half years prior to the present.
In this report, you can only see the change in the number of patents/patent applications by company or technology, whereas Patent Integration allows you to quickly compare the number of patent applications with your competitors in each technical field by cross-referencing with other keywords and patent classifications.
Patent Landscape ({{ld.d.db_name | country_map: 'en'}})
Patent landscaping is a visualization of the distribution of patent filings (application focus areas) for each technical keyword. Mountains and islands indicated by heatmap contours represent clusters of patent applications filed, and red areas on the heatmap indicate many patent filings relating to the keyword.
The patent landscape for 建築構造の接合一般技術 gives an intuitive understanding of what patent filings they have made and what technical position is to be established. By selecting filing year checkboxes and filtering, you can track their past filing trends (what technical area they have focused on).
By selecting applicant/patent holder checkboxes and filtering, you can visually grasp the technical areas of the filings for each applicant and the partnerships or alliances formed. Please use it as a guide for patent analysis and IP landscaping.
In addition, by visually representing the patent data in this manner, you can convincingly show the technical positions of your company and its competitors to your management and business strategists in order to formulate management strategies and business strategies.
In Patent Integration, you can check the specifics of a patent filing by clicking anywhere on the patent landscape screen. You can also quickly check the position of each applicant for each technical field by cross-referencing with other keywords and patent classifications. You can use it as a guide when considering hypotheses about each company's IP strategy on the IP Landscape. You can also use it for higher-grade intellectual property activities. It has reasonable pricing and a simple user interface that is easy for beginners to handle.
Characteristic Terms (Importance)
The following is a list of words (characteristic terms) often used in 建築構造の接合一般技術 patent applications. Characteristic terms with a higher importance are used in more patents/patent applications.
Search Set (Analysis Patents)
This patent analysis report was created for a patent search set of 3,203 cases retrieved by applying the following search formula and analysis period to the following patent database. Patent information such as a patent analysis result, a patent map, and a patent landscape can be freely used for patent searches, analysis, and work on intellectual property strategies, including IP landscaping.
建築構造の接合一般技術[2E125]
Same industry / competition company information (JP)
The patent information of the higher applicant in the technical theme 建築構造の接合一般技術 is shown below. By comparing the number of patents of each company, you can check the research and development status of each company's past and present technical themes and the position of each company in the technical theme.
Trends in filing of joint patent applications in the last 3 years (2022 to 2024).
Comparing the number of applications of each company, 大和ハウス工業株式会社 has the highest number of joint applications in the last in the last 3 years (2022 to 2024) with 65 cases, followed by 株式会社竹中工務店 with 41 cases.
| Name | Cases |
|---|---|
| 大和ハウス工業株式会社 | 65 cases |
| 株式会社竹中工務店 | 41 cases |
| 株式会社大林組 | 40 cases |
| 清水建設株式会社 | 30 cases |
| 日本製鉄株式会社 | 25 cases |
| 大成建設株式会社 | 18 cases |
| 鹿島建設株式会社 | 16 cases |
| JFEスチール株式会社 | 15 cases |
| 積水ハウス株式会社 | 10 cases |
| ミサワホーム株式会社 | 4 cases |
| 積水化学工業株式会社 | 1 cases |
Trends in filing of joint patent applications for the target period (2014 to 2024).
Comparing the number of applications of each company, 株式会社竹中工務店 has the highest number of joint applications in the last for the target period (2014 to 2024) with 288 cases, followed by 大和ハウス工業株式会社 with 198 cases.
| Name | Cases |
|---|---|
| 株式会社竹中工務店 | 288 cases |
| 大和ハウス工業株式会社 | 198 cases |
| 清水建設株式会社 | 146 cases |
| 日本製鉄株式会社 | 141 cases |
| 株式会社大林組 | 124 cases |
| 大成建設株式会社 | 110 cases |
| 鹿島建設株式会社 | 87 cases |
| JFEスチール株式会社 | 68 cases |
| 積水ハウス株式会社 | 57 cases |
| 積水化学工業株式会社 | 21 cases |
| ミサワホーム株式会社 | 17 cases |
Same industry / competition company, Change in the Number of JP Patents
Below is a patent map showing changes in the number of applications for JP patents of 11 companies in the same industry over the past 20 years.
Top company information (JP)
The patent information of the higher applicant in the technical theme 建築構造の接合一般技術 is shown below. By comparing the number of patents of each company, you can check the research and development status of each company's past and present technical themes and the position of each company in the technical theme.
Trends in filing of joint patent applications in the last 3 years (2022 to 2024).
among the top coapplicants, 大和ハウス工業株式会社 has the highest number of joint applications in the last in the last 3 years (2022 to 2024) with 65 cases, followed by 株式会社竹中工務店 with 41 cases.
Trends in filing of joint patent applications for the target period (2014 to 2024).
among the top coapplicants, 株式会社竹中工務店 has the highest number of joint applications in the last for the target period (2014 to 2024) with 288 cases, followed by 大和ハウス工業株式会社 with 198 cases.
Top company, Change in the Number of JP Patents
Below is a ranking of the number of JP patent applications by 建築構造の接合一般技術’s top 7 coapplicants over the last 20 years.
Below is a patent map showing the changes in the numbers of JP patent filings by 建築構造の接合一般技術’s top 7 coapplicants over the last 20 years.
Top company Details (JP)
Trends in filing of joint patent applications with 株式会社竹中工務店
建築構造の接合一般技術 filed 288 joint applications with 株式会社竹中工務店 for the analysis period (2014 to 2024).
The mean of the number of filings over the last 5 years (2018 to 2023, 192 cases in total) is 32.0, and the median is 34.0. The coefficient of variation (standard deviation/mean) is 0.3, and there have been big fluctuations in the number of filings from year to year.
The highest number of filings in 2018 with 45 cases, and their lowest number in 2014 with 14 cases.
| Index | Value |
|---|---|
| Average | 32.0 patents |
| Std Dev | 10.2 |
| COV | 0.3 |
| Year | Cases | YOY |
|---|---|---|
| 2022 year | 28 cases | -6.67 % |
| 2021 year | 30 cases | -21.05 % |
| 2020 year | 38 cases | 0 |
Trends in filing of joint patent applications with 清水建設株式会社
建築構造の接合一般技術 filed 146 joint applications with 清水建設株式会社 for the analysis period (2014 to 2024).
The mean of the number of filings over the last 5 years (2018 to 2023, 87 cases in total) is 14.5, and the median is 14.0. The coefficient of variation (standard deviation/mean) is 0.26, and there have been small fluctuations in the number of filings from year to year.
The number of filings has been increasing for the last 3 years (2020 to 2023). The highest number of filings in 2022 with 21 cases, and their lowest number in 2016 with 10 cases.
| Index | Value |
|---|---|
| Average | 14.5 patents |
| Std Dev | 3.8 |
| COV | 0.26 |
| Year | Cases | YOY |
|---|---|---|
| 2022 year | 21 cases | +23.53 % |
| 2021 year | 17 cases | +13.33 % |
| 2020 year | 15 cases | +25.00 % |
Trends in filing of joint patent applications with 日本製鉄株式会社
建築構造の接合一般技術 filed 141 joint applications with 日本製鉄株式会社 for the analysis period (2014 to 2024).
The mean of the number of filings over the last 5 years (2018 to 2023, 80 cases in total) is 13.3, and the median is 12.5. The coefficient of variation (standard deviation/mean) is 0.3, and there have been big fluctuations in the number of filings from year to year.
The number of filings has been decreasing for the last 3 years (2020 to 2023). The highest number of filings in 2018 with 22 cases, and their lowest number in 2014 with 6 cases.
| Index | Value |
|---|---|
| Average | 13.3 patents |
| Std Dev | 4.2 |
| COV | 0.3 |
| Year | Cases | YOY |
|---|---|---|
| 2022 year | 14 cases | +55.6 % |
| 2021 year | 9 cases | -25.00 % |
| 2020 year | 12 cases | -7.69 % |
Trends in filing of joint patent applications with 大和ハウス工業株式会社
建築構造の接合一般技術 filed 198 joint applications with 大和ハウス工業株式会社 for the analysis period (2014 to 2024).
The mean of the number of filings over the last 5 years (2018 to 2023, 135 cases in total) is 22.5, and the median is 21.5. The coefficient of variation (standard deviation/mean) is 0.5, and there have been big fluctuations in the number of filings from year to year.
The number of filings has been increasing for the last 3 years (2020 to 2023). The highest number of filings in 2022 with 42 cases, and their lowest number in 2016 with 9 cases.
| Index | Value |
|---|---|
| Average | 22.5 patents |
| Std Dev | 10.4 |
| COV | 0.5 |
| Year | Cases | YOY |
|---|---|---|
| 2022 year | 42 cases | +55.6 % |
| 2021 year | 27 cases | +145 % |
| 2020 year | 11 cases | -8.33 % |
Trends in filing of joint patent applications with 鹿島建設株式会社
建築構造の接合一般技術 filed 87 joint applications with 鹿島建設株式会社 for the analysis period (2014 to 2024).
The mean of the number of filings over the last 5 years (2018 to 2023, 45 cases in total) is 7.5, and the median is 7.5. The coefficient of variation (standard deviation/mean) is 0.3, and there have been big fluctuations in the number of filings from year to year.
The number of filings has been decreasing for the last 3 years (2020 to 2023). The highest number of filings in 2014 with 13 cases, and their lowest number in 2019 with 5 cases.
| Index | Value |
|---|---|
| Average | 7.5 patents |
| Std Dev | 2.4 |
| COV | 0.3 |
| Year | Cases | YOY |
|---|---|---|
| 2022 year | 8 cases | -33.3 % |
| 2021 year | 12 cases | +50.0 % |
| 2020 year | 8 cases | +60.0 % |
Information on important patents (JP)
The following shows JP patents held by 建築構造の接合一般技術 that have had an invalidation trial against them demanded or an opposition filed against them by a third party, and 建築構造の接合一般技術’s JP patents/patent applications of high importance cited by Examiners in patent examination processes.
By noting the most important patents, you can obtain knowledge of the competitive business environment in which 建築構造の接合一般技術 is placed (e.g., whether it is a fiercely competitive environment or an oligopolistic market and the like). In general, it can be understood that a company with a large number of demands for invalidation trials is developing their business in a business environment where IP disputes are common.
If you want to search for more detailed information, you can use Patent Integration to retrieve and download by company cited patents/patent applications or patents undergoing invalidation trials. You can quickly extract important patents from a patent set that includes multiple competitors by cross-referencing with other keywords and patent classifications. Please consider using it for searches for important patents/patent applications.
Glossary
- Cited
- Indicates that the patent/patent application has been cited (by Examiners) in notices of reasons for rejection in the examination process of other (Japanese, U.S., or European) patent applications. The higher the number of citations, the more important the patent/patent application is considered to be.
- Request for invalidation trial
- Indicates that a third party has requested a procedure to invalidate the patent. It is likely to affect the business of third parties and is considered to be of high importance.
- Opposition
- Indicates that a third party has filed a petition with the Patent Office to hear the validity of the patent again. Like the trial for invalidation, it is considered to be of high importance.
- Information provision
- Indicates that a third party has provided the Patent Office with useful information for examination for the patent filed. It is usually considered to be of high importance because it is done to prevent the patent from being granted.
- Browsing request
- Indicates that a third party has requested the Patent Office to view the patent bag (a set of documents exchanged between the Patent Office and the applicant). The bag is often checked prior to trial for invalidation, opposition, and provision of information, and is considered to be a highly important patent.
Invalidationed Trial cases
List of latest Invalidationed Trial patents
In the last 3 years (2021-12-01 ~ 2024-11-30), there were 1 patents Invalidation Trial from third parties. The average number of Invalidation Trial is 1.0 times. The most recently Invalidation Trial patent is 特許5634732 "締結金物" (Invalidation Trial day 2023-12-15) .
| - | No. | Title | Invalidation Trial days |
|---|---|---|---|
| 1 | 特許5634732 | 締結金物 | 2023-12-15 |
Oppositioned cases
List of latest Oppositioned patents
In the last 3 years (2021-12-01 ~ 2024-11-30), there were 2 patents Opposition from third parties. The average number of Opposition is 1.0 times. The most recently Opposition patent is 特許7175694 "座屈拘束ブレース" (Opposition day 2023-05-19) , next is 特許7116269 "ノンダイアフラムブレース構造" (Opposition day 2023-02-08) .
| - | No. | Title | Opposition days |
|---|---|---|---|
| 1 | 特許7175694 | 座屈拘束ブレース | 2023-05-19 |
| 2 | 特許7116269 | ノンダイアフラムブレース構造 | 2023-02-08 |
Protested cases
List of latest Protested patents
In the last 3 years (2021-12-01 ~ 2024-11-30), there were 29 patents Protest from third parties. The average number of Protest is 1.3 times. The most recently Protest patent is 特開2022-011954 "高力ボルト摩擦接合構造" (Protest day 2024-10-16) , next is 特開2024-044694 "荷重伝達構造および荷重伝達構造の構築方法" (Protest day 2024-07-29) .
| - | No. | Title | Protest days |
|---|---|---|---|
| 1 | 特開2022-011954 | 高力ボルト摩擦接合構造 | 2024-10-16 |
| 2 | 特開2024-044694 | 荷重伝達構造および荷重伝達構造の構築方法 | 2024-07-29 |
| 3 | 特開2022-149559 | 接合構造、組立Ｈ形鋼および接合構造の施工方法 | 2024-06-20 |
| 4 | 特開2023-057883 | 接合構造および接合方法 | 2024-04-01 |
| 5 | 特開2023-149372 | 大梁・小梁接合構造 | 2024-03-19 |
| 6 | 特許7499203 | 木質耐震壁の構築方法および木質耐震壁 | 2024-02-26 |
| 7 | 特開2023-170319 | ラグスクリューボルト及びその木質材への埋設方法 | 2024-01-10 |
| 8 | 特開2023-128761 | 木部材の接合構造および木部材の接合方法 | 2023-12-15 |
| 9 | 特許7517291 | 柱梁接合部の構造 | 2023-11-14 |
| 10 | 特開2022-146459 | 二液混合型モルタル組成物及び吐出装置 | 2023-10-25 |
| 11 | 特許7506033 | 溶接組立Ｈ形鋼梁、柱梁接合構造 | 2023-10-16 |
| 12 | 特許7586679 | 木質重ね軸部材 | 2023-10-16 |
| 13 | 特許7603388 | 木質柱鋼製仕口部材接合構造 | 2023-09-13 |
| 14 | 特許7368800 | 構造材 | 2023-04-14 |
| 15 | 特開2022-121089 | あと施工アンカー | 2023-04-10 |
| 16 | 特許7380126 | 接合部材、接合構造、接合方法、誘導装置、および、誘導方法 | 2023-03-07 |
| 17 | 特許7297648 | 形材の接合構造および屋根構造体 | 2023-01-11 |
| 18 | 特許7271454 | ハイブリッド梁構造 | 2022-11-18 |
| 19 | 特許7271455 | ハイブリッド梁の施工方法 | 2022-11-18 |
| 20 | 特許7271453 | ハイブリッド梁構造 | 2022-11-18 |
Top Patents/Patent Applications with the Highest Number of Protested
Of the patent applications filed in the last 10 years (2014-12-01 to 2024-11-30), 61 patents/patent applications were protest more than once in the examination process of other patent applications. The mean of the number of protest is 1.2. The most protest patent is 特許7368800 "構造材" (6 times) , and the next most protest patent is 特許7175694 "座屈拘束ブレース" (2 times) .
| - | No. | Title | |
|---|---|---|---|
| 1 | 特許7368800 | 構造材 | 6 times |
| 2 | 特許7175694 | 座屈拘束ブレース | 2 times |
| 3 | 特許6590187 | 木質材と鉄骨材の接合部構造 | 2 times |
| 4 | 特許6956466 | 鉄骨梁および柱梁接合構造 | 2 times |
| 5 | 特許6815183 | 複合建物 | 2 times |
Inspectioned cases
List of latest Inspectioned patents
In the last 3 years (2021-12-01 ~ 2024-11-30), there were 29 patents Inspection from third parties. The average number of Inspection is 1.1 times. The most recently Inspection patent is 特開2022-011954 "高力ボルト摩擦接合構造" (Inspection day 2024-11-18) , next is 特開2024-044694 "荷重伝達構造および荷重伝達構造の構築方法" (Inspection day 2024-08-07) .
| - | No. | Title | Inspection days |
|---|---|---|---|
| 1 | 特開2022-011954 | 高力ボルト摩擦接合構造 | 2024-11-18 |
| 2 | 特開2024-044694 | 荷重伝達構造および荷重伝達構造の構築方法 | 2024-08-07 |
| 3 | 特開2022-149559 | 接合構造、組立Ｈ形鋼および接合構造の施工方法 | 2024-06-25 |
| 4 | 特開2023-170319 | ラグスクリューボルト及びその木質材への埋設方法 | 2024-06-21 |
| 5 | 特開2023-057883 | 接合構造および接合方法 | 2024-04-09 |
| 6 | 特開2023-149372 | 大梁・小梁接合構造 | 2024-04-09 |
| 7 | 特許7499203 | 木質耐震壁の構築方法および木質耐震壁 | 2024-03-19 |
| 8 | 特許7517291 | 柱梁接合部の構造 | 2023-12-05 |
| 9 | 特開2022-146459 | 二液混合型モルタル組成物及び吐出装置 | 2023-11-27 |
| 10 | 特許7506033 | 溶接組立Ｈ形鋼梁、柱梁接合構造 | 2023-11-16 |
| 11 | 特開2024-154349 | 土木建築構造の垂直部材と水平部材をＣ型接合部品とＨ型結合部品の 嵌合 部品で構造部材それぞれを着脱し再利用することができる接合構造。 | 2023-11-06 |
| 12 | 特許7586679 | 木質重ね軸部材 | 2023-10-18 |
| 13 | 特許7116269 | ノンダイアフラムブレース構造 | 2023-09-12 |
| 14 | 特開2020-197039 | 連結構造 | 2023-05-18 |
| 15 | 特許7297648 | 形材の接合構造および屋根構造体 | 2023-02-20 |
| 16 | 特許7271454 | ハイブリッド梁構造 | 2022-12-01 |
| 17 | 特許7271455 | ハイブリッド梁の施工方法 | 2022-12-01 |
| 18 | 特許7271453 | ハイブリッド梁構造 | 2022-12-01 |
| 19 | 特許7530091 | 打ち込み式ファスナピン | 2022-11-16 |
| 20 | 特許7195081 | スカラップ及びそのスカラップを用いた梁端現場接合部 | 2022-11-01 |
Top Patents/Patent Applications with the Highest Number of Inspectioned
Of the patent applications filed in the last 10 years (2014-12-01 to 2024-11-30), 50 patents/patent applications were inspection more than once in the examination process of other patent applications. The mean of the number of inspection is 1.1. The most inspection patent is 特許7175694 "座屈拘束ブレース" (2 times) , and the next most inspection patent is 特開2022-146459 "二液混合型モルタル組成物及び吐出装置" (2 times) .
| - | No. | Title | |
|---|---|---|---|
| 1 | 特許7175694 | 座屈拘束ブレース | 2 times |
| 2 | 特開2022-146459 | 二液混合型モルタル組成物及び吐出装置 | 2 times |
| 3 | 特許6956466 | 鉄骨梁および柱梁接合構造 | 2 times |
| 4 | 特許6577102 | 箱型建築物ユニットおよび建築物 | 2 times |
| 5 | 特許7323201 | 連結構造 | 2 times |
Cited cases
Top Patents/Patent Applications with the Highest Number of Cited
Of the patent applications filed in the last 10 years (2014-12-01 to 2024-11-30), 746 patents/patent applications were cited more than once in the examination process of other patent applications. The mean of the number of cited is 1.9. The most cited patent is 特許7040725 "建物" (14 times) , and the next most cited patent is 特許7059788 "木質構造" (14 times) .
| - | No. | Title | |
|---|---|---|---|
| 1 | 特許7040725 | 建物 | 14 times |
| 2 | 特許7059788 | 木質構造 | 14 times |
| 3 | 特許6431450 | 床構造 | 13 times |
| 4 | 特許7278587 | 筋交い金物およびそれを用いた木造建物の接合構造 | 11 times |
| 5 | 特開2016-176216 | 仕口部の接合装置、仕口部の接合構造、及び仕口部の接合方法 | 10 times |
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