ナット (JP Patent Analysis Report)
The Technical Field "ナット" had 639 patent application filings in the most recent period (2022-01-01 to 2022-07-31). This is a with an decreasing trend transition of -154 filings (-19.4%) over 793 they had in the same period of the previous year (2021-01-01 to 2021-07-31).
The highest number of filings in 2014 with 2,066 cases, and their lowest number in 2022 with 931 cases.
The mean of the number of filings over the last 5 years (2018 to 2023, 7,336 cases in total) is 1,223, and the median is 1,436. 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.
| Index | Value |
|---|---|
| Average | 1,223 patents |
| Std Dev | 554 |
| COV | 0.5 |
| Year | Cases | YOY |
|---|---|---|
| 2022 year | 931 cases | -32.2 % |
| 2021 year | 1,374 cases | -8.22 % |
| 2020 year | 1,497 cases | -9.60 % |
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 ナット for the period of the last 10 years (2014-01-01 to 2024-03-31). 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 ナット, 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.
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.
ナット, Changes in the Number of JP Patents/Patent Applications
The changes in the number of patent filings of ナット 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.
Search Set (Analysis Patents)
This patent analysis report was created for a patent search set of 15,265 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.
ナット
Related Patent Analysis Report
A patent aanlysis report on the following synonyms was found in the technical term "ナット".
- ナット (Main page / Including the following synonyms)
Same industry / competition company information (JP)
The number of patents and changes in the number of patents of other companies (competitors) in the same industry as ナット are shown below.
Comparison of changes in the number of patents with peers and competitors is an important analytical index for understanding the intellectual property strategies of each company. By checking the transition of the number of patents for each company / competitor, you can check the status of focus on technology development and R&D for each company / technology.
It should be noted that patents have a time lag of one and a half years from filing to publication, so it is not possible to analyze the situation more recent than one and a half years.
If you want to find out more information, " Patent Integration , You can compare the number of patent applications with competitors in each technical field in a short time by multiplying with other keywords and patent classifications.Please use it for more detailed patent information analysis such as selection of M&A candidate destinations and alliance destinations.
Trends in filing of joint patent applications in the last 3 years (2022 to 2024).
Comparing the number of applications of each company, 日本精工株式会社 has the highest number of joint applications in the last in the last 3 years (2022 to 2024) with 70 cases, followed by NTN株式会社 with 24 cases.
| Name | Cases |
|---|---|
| 日本精工株式会社 | 70 cases |
| NTN株式会社 | 24 cases |
| トヨタ自動車株式会社 | 10 cases |
| 三菱重工業株式会社 | 8 cases |
| 積水化学工業株式会社 | 6 cases |
| 本田技研工業株式会社 | 4 cases |
| 三菱電機株式会社 | 4 cases |
| 株式会社日立製作所 | 3 cases |
| 株式会社東芝 | 2 cases |
| 日産自動車株式会社 | 2 cases |
| 株式会社ジェイテクト | 1 cases |
Trends in filing of joint patent applications for the target period (2014 to 2024).
Comparing the number of applications of each company, 日本精工株式会社 has the highest number of joint applications in the last for the target period (2014 to 2024) with 496 cases, followed by NTN株式会社 with 247 cases.
| Name | Cases |
|---|---|
| 日本精工株式会社 | 496 cases |
| NTN株式会社 | 247 cases |
| トヨタ自動車株式会社 | 242 cases |
| 株式会社ジェイテクト | 231 cases |
| 本田技研工業株式会社 | 198 cases |
| 三菱電機株式会社 | 135 cases |
| 株式会社日立製作所 | 83 cases |
| 積水化学工業株式会社 | 78 cases |
| 三菱重工業株式会社 | 58 cases |
| 株式会社東芝 | 47 cases |
| 日産自動車株式会社 | 25 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 number of patents and changes in the number of patents of other companies (competitors) in the same industry as ナット are shown below.
Comparison of changes in the number of patents with peers and competitors is an important analytical index for understanding the intellectual property strategies of each company. By checking the transition of the number of patents for each company / competitor, you can check the status of focus on technology development and R&D for each company / technology.
It should be noted that patents have a time lag of one and a half years from filing to publication, so it is not possible to analyze the situation more recent than one and a half years.
If you want to find out more information, " Patent Integration , You can compare the number of patent applications with competitors in each technical field in a short time by multiplying with other keywords and patent classifications.Please use it for more detailed patent information analysis such as selection of M&A candidate destinations and alliance destinations.
Trends in filing of joint patent applications in the last 3 years (2022 to 2024).
Among the top coapplicants, 日本精工株式会社 has the highest number of joint applications in the last in the last 3 years (2022 to 2024) with 70 cases, followed by NTN株式会社 with 24 cases.
| Name | Cases |
|---|---|
| 日本精工株式会社 | 70 cases |
| NTN株式会社 | 24 cases |
| トヨタ自動車株式会社 | 10 cases |
| 本田技研工業株式会社 | 4 cases |
| 三菱電機株式会社 | 4 cases |
| 株式会社東芝 | 2 cases |
| 株式会社ジェイテクト | 1 cases |
Trends in filing of joint patent applications for the target period (2014 to 2024).
Among the top coapplicants, 日本精工株式会社 has the highest number of joint applications in the last for the target period (2014 to 2024) with 496 cases, followed by NTN株式会社 with 247 cases.
| Name | Cases |
|---|---|
| 日本精工株式会社 | 496 cases |
| NTN株式会社 | 247 cases |
| トヨタ自動車株式会社 | 242 cases |
| 株式会社ジェイテクト | 231 cases |
| 本田技研工業株式会社 | 198 cases |
| 三菱電機株式会社 | 135 cases |
| 株式会社東芝 | 47 cases |
Top company, Change in the Number of JP Patents
Below is a ranking of the number of JP patent applications by ナット’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 ナット’s top 7 coapplicants over the last 20 years.
Top company Details (JP)
Trends in filing of joint patent applications with 日本精工株式会社
ナット filed 496 joint applications with 日本精工株式会社 for the analysis period (2014 to 2024).
The mean of the number of filings over the last 5 years (2018 to 2023, 236 cases in total) is 39.3, and the median is 41.0. 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 2014 with 103 cases, and their lowest number in 2020 with 22 cases.
| Index | Value |
|---|---|
| Average | 39.3 patents |
| Std Dev | 21.2 |
| COV | 0.5 |
| Year | Cases | YOY |
|---|---|---|
| 2022 year | 65 cases | +4.84 % |
| 2021 year | 62 cases | +182 % |
| 2020 year | 22 cases | -38.9 % |
Trends in filing of joint patent applications with トヨタ自動車株式会社
ナット filed 242 joint applications with トヨタ自動車株式会社 for the analysis period (2014 to 2024).
The mean of the number of filings over the last 5 years (2018 to 2023, 112 cases in total) is 18.7, and the median is 19.5. The coefficient of variation (standard deviation/mean) is 0.6, and there have been relatively large fluctuations in the number of filings from year to year.
The highest number of filings in 2015 with 43 cases, and their lowest number in 2022 with 10 cases.
| Index | Value |
|---|---|
| Average | 18.7 patents |
| Std Dev | 11.5 |
| COV | 0.6 |
| Year | Cases | YOY |
|---|---|---|
| 2022 year | 10 cases | -47.4 % |
| 2021 year | 19 cases | -29.63 % |
| 2020 year | 27 cases | +35.0 % |
Trends in filing of joint patent applications with 本田技研工業株式会社
ナット filed 198 joint applications with 本田技研工業株式会社 for the analysis period (2014 to 2024).
The mean of the number of filings over the last 5 years (2018 to 2023, 69 cases in total) is 11.5, and the median is 13.5. The coefficient of variation (standard deviation/mean) is 0.6, and there have been relatively large 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 44 cases, and their lowest number in 2022 with 4 cases.
| Index | Value |
|---|---|
| Average | 11.5 patents |
| Std Dev | 7.3 |
| COV | 0.6 |
| Year | Cases | YOY |
|---|---|---|
| 2022 year | 4 cases | -75.0 % |
| 2021 year | 16 cases | +45.5 % |
| 2020 year | 11 cases | -45.0 % |
Trends in filing of joint patent applications with NTN株式会社
ナット filed 247 joint applications with NTN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, 89 cases in total) is 14.8, and the median is 14.0. The coefficient of variation (standard deviation/mean) is 0.6, 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 2015 with 54 cases, and their lowest number in 2021 with 12 cases.
| Index | Value |
|---|---|
| Average | 14.8 patents |
| Std Dev | 8.4 |
| COV | 0.6 |
| Year | Cases | YOY |
|---|---|---|
| 2022 year | 24 cases | +100 % |
| 2021 year | 12 cases | -7.69 % |
| 2020 year | 13 cases | -13.33 % |
Trends in filing of joint patent applications with 三菱電機株式会社
ナット filed 135 joint applications with 三菱電機株式会社 for the analysis period (2014 to 2024).
The mean of the number of filings over the last 5 years (2018 to 2023, 58 cases in total) is 9.7, and the median is 10.5. The coefficient of variation (standard deviation/mean) is 0.6, and there have been relatively large 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 2015 with 21 cases, and their lowest number in 2022 with 4 cases.
| Index | Value |
|---|---|
| Average | 9.7 patents |
| Std Dev | 6.2 |
| COV | 0.6 |
| Year | Cases | YOY |
|---|---|---|
| 2022 year | 4 cases | -63.6 % |
| 2021 year | 11 cases | +10.00 % |
| 2020 year | 10 cases | -47.4 % |
Information on important patents (JP)
The following shows JP patents held by ナット that have had an invalidation trial against them demanded or an opposition filed against them by a third party, and ナット’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 ナット 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.
Oppositioned cases
List of latest Oppositioned patents
In the last 3 years (2021-04-01 ~ 2024-03-31), there were 16 patents Opposition from third parties. The average number of Opposition is 1.0 times. The most recently Opposition patent is 特許7260925 "液体処理ノズル" (Opposition day 2023-08-01) , next is 特許7150367 "リフター" (Opposition day 2023-04-10) .
| - | No. | Title | Opposition days |
|---|---|---|---|
| 1 | 特許7260925 | 液体処理ノズル | 2023-08-01 |
| 2 | 特許7150367 | リフター | 2023-04-10 |
| 3 | 特許7113807 | フランジ継手の締結過程の学習方法及びフランジ継手の締結過程の学習システム | 2023-02-02 |
| 4 | 特許7112059 | レンズ鏡筒 | 2023-01-30 |
| 5 | 特許7097634 | シールドセグメントのグラウトホール用止水構造 | 2022-12-16 |
| 6 | 特許7082522 | プレキャスト合成床版の継手構造 | 2022-10-17 |
| 7 | 特許7067390 | インサート成形品の製造方法 | 2022-07-28 |
| 8 | 特許6989166 | 補強材を用いた耐火パネル | 2022-07-05 |
| 9 | 特許6978275 | 水路 | 2022-06-07 |
| 10 | 特許7014331 | チャック及び工作機械 | 2022-04-28 |
Protested cases
List of latest Protested patents
In the last 3 years (2021-04-01 ~ 2024-03-31), there were 65 patents Protest from third parties. The average number of Protest is 1.2 times. The most recently Protest patent is 特開2024-016724 "電動弁および電動弁装置、ならびに、電動弁装置の組立方法" (Protest day 2024-03-22) , next is 特開2022-074652 "消火栓設備" (Protest day 2024-03-04) .
| - | No. | Title | Protest days |
|---|---|---|---|
| 1 | 特開2024-016724 | 電動弁および電動弁装置、ならびに、電動弁装置の組立方法 | 2024-03-22 |
| 2 | 特開2022-074652 | 消火栓設備 | 2024-03-04 |
| 3 | 特開2021-161678 | 便器装置用機能部ユニット、便器装置、機能部の設置方法 | 2024-02-08 |
| 4 | 特開2023-098778 | 外壁面用化粧材の取付構造 | 2024-02-07 |
| 5 | 特開2022-131896 | 燃料電池スタック及び燃料電池ユニット | 2023-12-25 |
| 6 | 特開2023-009748 | 摩擦係数安定剤排出機能を備えた締結部材 | 2023-12-22 |
| 7 | 特開2023-022391 | 摩擦係数安定剤排出機能を備えた締結部材 | 2023-12-22 |
| 8 | 特開2022-011637 | ノズル取付部材 | 2023-10-30 |
| 9 | 特許7467073 | 水抜き装置及び水抜き装置の取り付け方法 | 2023-10-04 |
| 10 | 特開2022-165104 | 可動電極側装置及びそれを用いた小物部品供給ユニット | 2023-09-28 |
| 11 | 特許7355937 | 電子膨張弁 | 2023-08-31 |
| 12 | 特許7447062 | 双頭スパナ | 2023-08-18 |
| 13 | 特開2023-086891 | 管接続部材撤去装置 | 2023-07-11 |
| 14 | 特開2022-121089 | あと施工アンカー | 2023-04-10 |
| 15 | 特開2023-007877 | 扉装置 | 2023-03-30 |
| 16 | 特許7283748 | 排水桝 | 2023-03-28 |
| 17 | 特許7369225 | 電子膨張弁 | 2023-02-17 |
| 18 | 特許7340030 | 電子膨張弁及び冷却システム | 2023-02-17 |
| 19 | 特許7349514 | 電子膨張弁 | 2023-02-01 |
| 20 | 特許7356521 | 電子膨張弁及びその取り付け方法 | 2022-12-09 |
Top Patents/Patent Applications with the Highest Number of Protested
Of the patent applications filed in the last 10 years (2014-04-01 to 2024-03-31), 126 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7291943 "経緯台及び望遠鏡システム" (6 times) , and the next most protest patent is 特開2016-202064 "農作業機" (5 times) .
| - | No. | Title | |
|---|---|---|---|
| 1 | 特許7291943 | 経緯台及び望遠鏡システム | 6 times |
| 2 | 特開2016-202064 | 農作業機 | 5 times |
| 3 | 特許6486350 | 積層装置 | 2 times |
| 4 | 特許6758337 | 折板屋根用ソーラーパネル取付装置 | 2 times |
| 5 | 特許6371249 | ハンドガイドローラ | 2 times |
Inspectioned cases
List of latest Inspectioned patents
In the last 3 years (2021-04-01 ~ 2024-03-31), there were 63 patents Inspection from third parties. The average number of Inspection is 1.5 times. The most recently Inspection patent is 特開2024-016724 "電動弁および電動弁装置、ならびに、電動弁装置の組立方法" (Inspection day 2024-03-26) , next is 特開2021-161678 "便器装置用機能部ユニット、便器装置、機能部の設置方法" (Inspection day 2024-02-13) .
| - | No. | Title | Inspection days |
|---|---|---|---|
| 1 | 特開2024-016724 | 電動弁および電動弁装置、ならびに、電動弁装置の組立方法 | 2024-03-26 |
| 2 | 特開2021-161678 | 便器装置用機能部ユニット、便器装置、機能部の設置方法 | 2024-02-13 |
| 3 | 特開2022-131896 | 燃料電池スタック及び燃料電池ユニット | 2024-01-30 |
| 4 | 特開2023-009748 | 摩擦係数安定剤排出機能を備えた締結部材 | 2024-01-09 |
| 5 | 特開2023-022391 | 摩擦係数安定剤排出機能を備えた締結部材 | 2024-01-09 |
| 6 | 特開2022-011637 | ノズル取付部材 | 2023-10-31 |
| 7 | 特開2022-165104 | 可動電極側装置及びそれを用いた小物部品供給ユニット | 2023-10-31 |
| 8 | 特許7467073 | 水抜き装置及び水抜き装置の取り付け方法 | 2023-10-10 |
| 9 | 特許7357186 | 電極接続素子、これを備える発光装置及び発光装置の製造方法 | 2023-08-02 |
| 10 | 特開2023-138926 | エレベータのキャビンのガイドレール及び釣合い錘用の締結システム | 2023-06-29 |
| 11 | 特許5323665 | 鋏 | 2023-05-30 |
| 12 | 特許7150367 | リフター | 2023-04-24 |
| 13 | 特開2022-042034 | 推進軸 | 2023-04-21 |
| 14 | 特許7283748 | 排水桝 | 2023-04-18 |
| 15 | 特許7288213 | 巻鉄心 | 2022-12-16 |
| 16 | 特表2020-519354 | 外科手術用ロボットのための平行移動器具インターフェースおよびそれを備えている外科手術用ロボットシステム | 2022-12-15 |
| 17 | 特許7379344 | スライダ弁及びスライダ弁の使用 | 2022-12-14 |
| 18 | 特許7232970 | ストッパ機能付きの特装車用ドアヒンジ | 2022-12-13 |
| 19 | 特許7260108 | ボルト、ナット、座金、及びボルトナット締着構造 | 2022-12-09 |
| 20 | 特許7113807 | フランジ継手の締結過程の学習方法及びフランジ継手の締結過程の学習システム | 2022-11-30 |
Top Patents/Patent Applications with the Highest Number of Inspectioned
Of the patent applications filed in the last 10 years (2014-04-01 to 2024-03-31), 188 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 特開2016-202064 "農作業機" (5 times) , and the next most inspection patent is 特許7291943 "経緯台及び望遠鏡システム" (5 times) .
| - | No. | Title | |
|---|---|---|---|
| 1 | 特開2016-202064 | 農作業機 | 5 times |
| 2 | 特許7291943 | 経緯台及び望遠鏡システム | 5 times |
| 3 | 特許6758337 | 折板屋根用ソーラーパネル取付装置 | 3 times |
| 4 | 特表2020-519354 | 外科手術用ロボットのための平行移動器具インターフェースおよびそれを備えている外科手術用ロボットシステム | 2 times |
| 5 | 特許6577102 | 箱型建築物ユニットおよび建築物 | 2 times |
Cited cases
Top Patents/Patent Applications with the Highest Number of Cited
Of the patent applications filed in the last 10 years (2014-04-01 to 2024-03-31), 3,129 patents/patent applications were cited more than once in the examination process of other patent applications. The mean of the number of cited is 2.0. The most cited patent is 特許6325086 "同一の回転可能な出力部から動作される閉鎖駆動部と発射駆動部とを備える手術器具" (99 times) , and the next most cited patent is 特許6312612 "動吸振器" (52 times) .
| - | No. | Title | |
|---|---|---|---|
| 1 | 特許6325086 | 同一の回転可能な出力部から動作される閉鎖駆動部と発射駆動部とを備える手術器具 | 99 times |
| 2 | 特許6312612 | 動吸振器 | 52 times |
| 3 | 特許6734709 | 車体の下部構造 | 37 times |
| 4 | 特許6659934 | ステントバルブを圧縮／装填するための方法および装置 | 19 times |
| 5 | 特開2016-191264 | 軌道座屈防止装置及び軌道座屈防止装置を備えたバラスト軌道 | 19 times |
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