ころがり軸受技術 (JP Patent Analysis Report)
The Theme Code "ころがり軸受技術" had 284 patent application filings in the most recent period (2022-01-01 to 2022-08-31). This is a significantly decreased of -109 filings (-27.7%) over 393 they had in the same period of the previous year (2021-01-01 to 2021-08-31).
The highest number of filings in 2015 with 894 cases, and their lowest number in 2022 with 398 cases.
The mean of the number of filings over the last 5 years (2018 to 2023, 2,774 cases in total) is 462, and the median is 518. 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 | 462 patents |
| Std Dev | 216 |
| COV | 0.5 |
The number of filings has been decreasing for the last 3 years (2020 to 2023).
| Year | Cases | YOY |
|---|---|---|
| 2022 year | 398 cases | -30.5 % |
| 2021 year | 573 cases | +23.49 % |
| 2020 year | 464 cases | -26.47 % |
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 ころがり軸受技術[3J701] for the period of the last 10 years (2014-01-01 to 2024-04-30). 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 ころがり軸受技術, 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 ころがり軸受技術
- 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.
ころがり軸受技術, Changes in the Number of JP Patents/Patent Applications
The changes in the number of patent filings of ころがり軸受技術 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 ころがり軸受技術 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 ころがり軸受技術 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 6,165 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.
ころがり軸受技術[3J701]
Same industry / competition company information (JP)
The patent information of the higher applicant in the technical theme ころがり軸受技術 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, NTN株式会社 has the highest number of joint applications in the last in the last 3 years (2022 to 2024) with 142 cases, followed by 日本精工株式会社 with 108 cases.
| Name | Cases |
|---|---|
| NTN株式会社 | 142 cases |
| 日本精工株式会社 | 108 cases |
| ミネベアミツミ株式会社 | 21 cases |
| 日本トムソン株式会社 | 14 cases |
| 株式会社不二越 | 14 cases |
| 株式会社ジェイテクト | 12 cases |
| 内山工業株式会社 | 8 cases |
| THK株式会社 | 2 cases |
| 本田技研工業株式会社 | 2 cases |
| トヨタ自動車株式会社 | 1 cases |
| 株式会社東芝 | 1 cases |
Trends in filing of joint patent applications for the target period (2014 to 2024).
Comparing the number of applications of each company, NTN株式会社 has the highest number of joint applications in the last for the target period (2014 to 2024) with 1,854 cases, followed by 日本精工株式会社 with 1,415 cases.
| Name | Cases |
|---|---|
| NTN株式会社 | 1,854 cases |
| 日本精工株式会社 | 1,415 cases |
| 株式会社ジェイテクト | 808 cases |
| ミネベアミツミ株式会社 | 94 cases |
| 日本トムソン株式会社 | 70 cases |
| トヨタ自動車株式会社 | 66 cases |
| 株式会社不二越 | 66 cases |
| 内山工業株式会社 | 65 cases |
| 本田技研工業株式会社 | 53 cases |
| THK株式会社 | 41 cases |
| 株式会社東芝 | 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 ころがり軸受技術 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, NTN株式会社 has the highest number of joint applications in the last in the last 3 years (2022 to 2024) with 142 cases, followed by 日本精工株式会社 with 108 cases.
| Name | Cases |
|---|---|
| NTN株式会社 | 142 cases |
| 日本精工株式会社 | 108 cases |
| ミネベアミツミ株式会社 | 21 cases |
| 株式会社ジェイテクト | 12 cases |
| THK株式会社 | 2 cases |
| トヨタ自動車株式会社 | 1 cases |
| 株式会社東芝 | 1 cases |
Trends in filing of joint patent applications for the target period (2014 to 2024).
among the top coapplicants, NTN株式会社 has the highest number of joint applications in the last for the target period (2014 to 2024) with 1,854 cases, followed by 日本精工株式会社 with 1,415 cases.
| Name | Cases |
|---|---|
| NTN株式会社 | 1,854 cases |
| 日本精工株式会社 | 1,415 cases |
| 株式会社ジェイテクト | 808 cases |
| ミネベアミツミ株式会社 | 94 cases |
| トヨタ自動車株式会社 | 66 cases |
| THK株式会社 | 41 cases |
| 株式会社東芝 | 17 cases |
Top company, Change in the Number of JP Patents
Below is a ranking of the number of JP patent applications by ころがり軸受技術’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 ころがり軸受技術’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
ころがり軸受技術 filed 1,415 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, 558 cases in total) is 93.0, and the median is 106. 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 decreasing for the last 3 years (2020 to 2023). The highest number of filings in 2014 with 341 cases, and their lowest number in 2020 with 82 cases.
| Index | Value |
|---|---|
| Average | 93.0 patents |
| Std Dev | 42.8 |
| COV | 0.5 |
| Year | Cases | YOY |
|---|---|---|
| 2022 year | 103 cases | -24.26 % |
| 2021 year | 136 cases | +65.9 % |
| 2020 year | 82 cases | -33.3 % |
Trends in filing of joint patent applications with NTN株式会社
ころがり軸受技術 filed 1,854 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, 904 cases in total) is 151, and the median is 163. 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 decreasing for the last 3 years (2020 to 2023). The highest number of filings in 2017 with 311 cases, and their lowest number in 2020 with 112 cases.
| Index | Value |
|---|---|
| Average | 151 patents |
| Std Dev | 78.5 |
| COV | 0.5 |
| Year | Cases | YOY |
|---|---|---|
| 2022 year | 136 cases | -37.9 % |
| 2021 year | 219 cases | +95.5 % |
| 2020 year | 112 cases | -41.1 % |
Trends in filing of joint patent applications with 株式会社ジェイテクト
ころがり軸受技術 filed 808 joint applications with 株式会社ジェイテクト for the analysis period (2014 to 2024).
The mean of the number of filings over the last 5 years (2018 to 2023, 273 cases in total) is 45.5, and the median is 44.0. The coefficient of variation (standard deviation/mean) is 0.8, and there have been relatively large fluctuations in the number of filings from year to year.
The highest number of filings in 2016 with 154 cases, and their lowest number in 2022 with 12 cases.
| Index | Value |
|---|---|
| Average | 45.5 patents |
| Std Dev | 35.5 |
| COV | 0.8 |
| Year | Cases | YOY |
|---|---|---|
| 2022 year | 12 cases | -45.5 % |
| 2021 year | 22 cases | -66.7 % |
| 2020 year | 66 cases | -20.48 % |
Trends in filing of joint patent applications with トヨタ自動車株式会社
ころがり軸受技術 filed 66 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, 28 cases in total) is 4.7, and the median is 4.5. The coefficient of variation (standard deviation/mean) is 0.8, and there have been relatively large fluctuations in the number of filings from year to year.
The highest number of filings in 2016 with 14 cases, and their lowest number in 2022 with 1 cases.
| Index | Value |
|---|---|
| Average | 4.7 patents |
| Std Dev | 3.8 |
| COV | 0.8 |
| Year | Cases | YOY |
|---|---|---|
| 2022 year | 1 cases | -85.7 % |
| 2021 year | 7 cases | -22.22 % |
| 2020 year | 9 cases | +350 % |
Trends in filing of joint patent applications with ミネベアミツミ株式会社
ころがり軸受技術 filed 94 joint applications with ミネベアミツミ株式会社 for the analysis period (2014 to 2024).
The mean of the number of filings over the last 5 years (2018 to 2023, 56 cases in total) is 9.3, and the median is 8.5. 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 increasing for the last 3 years (2020 to 2023). The highest number of filings in 2022 with 19 cases, and their lowest number in 2020 with 6 cases.
| Index | Value |
|---|---|
| Average | 9.3 patents |
| Std Dev | 5.5 |
| COV | 0.6 |
| Year | Cases | YOY |
|---|---|---|
| 2022 year | 19 cases | +72.7 % |
| 2021 year | 11 cases | +83.3 % |
| 2020 year | 6 cases | -50.0 % |
Information on important patents (JP)
The following shows JP patents held by ころがり軸受技術 that have had an invalidation trial against them demanded or an opposition filed against them by a third party, and ころがり軸受技術’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 ころがり軸受技術 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.
Oppositioned cases
List of latest Oppositioned patents
In the last 3 years (2021-05-01 ~ 2024-04-30), there were 9 patents Opposition from third parties. The average number of Opposition is 1.0 times. The most recently Opposition patent is 特許7307255 "窒化ケイ素焼結体の製造方法" (Opposition day 2024-01-09) , next is 特許7275714 "軸受状態監視方法及び軸受状態監視システム" (Opposition day 2023-11-17) .
| - | No. | Title | Opposition days |
|---|---|---|---|
| 1 | 特許7307255 | 窒化ケイ素焼結体の製造方法 | 2024-01-09 |
| 2 | 特許7275714 | 軸受状態監視方法及び軸受状態監視システム | 2023-11-17 |
| 3 | 特許7164658 | 窒化ケイ素焼結体、それを用いた転動体、および軸受 | 2023-04-21 |
| 4 | 特許7148426 | 潤滑組成物および転がり軸受 | 2023-04-04 |
| 5 | 特許7106057 | 球状ガラス、ガラス転動体及びガラス転動体の製造方法 | 2022-12-26 |
| 6 | 特許7060176 | 軸受要素の製造方法、軸受の製造方法、機械の製造方法、車両の製造方法、軸受要素、軸受、機械、及び車両 | 2022-07-22 |
| 7 | 特許6991210 | シール組立体、当該組立体を備えるころ軸受及び当該組立体を製造するための方法 | 2022-06-29 |
| 8 | 特許6957958 | ハブユニット軸受 | 2022-04-27 |
| 9 | 特許6787198 | ハブユニット軸受 | 2021-05-14 |
Protested cases
List of latest Protested patents
In the last 3 years (2021-05-01 ~ 2024-04-30), there were 14 patents Protest from third parties. The average number of Protest is 1.2 times. The most recently Protest patent is 特開2023-059592 "ハブユニット軸受の製造方法" (Protest day 2024-02-02) , next is 特開2023-090469 "ハブユニット軸受の組立方法及びハブユニット軸受" (Protest day 2024-02-02) .
| - | No. | Title | Protest days |
|---|---|---|---|
| 1 | 特開2023-059592 | ハブユニット軸受の製造方法 | 2024-02-02 |
| 2 | 特開2023-090469 | ハブユニット軸受の組立方法及びハブユニット軸受 | 2024-02-02 |
| 3 | 特開2021-188637 | 軸受装置 | 2024-01-19 |
| 4 | 特開2022-074471 | 軸受の試験方法 | 2023-12-22 |
| 5 | 特表2023-512306 | トライボロジーシステム | 2023-12-18 |
| 6 | 特開2021-004660 | 軸受および減速機 | 2023-09-01 |
| 7 | 特開2022-042162 | 転がり軸受 | 2023-07-21 |
| 8 | 特開2022-134633 | 車輪用軸受装置 | 2023-02-27 |
| 9 | 特開2022-135326 | 偏心揺動型減速装置 | 2022-11-07 |
| 10 | 特開2022-076505 | 転がり軸受 | 2022-09-19 |
| 11 | 特許7218242 | 導電性グリース組成物 | 2022-08-24 |
| 12 | 特開2019-203557 | 転がり軸受 | 2022-03-16 |
| 13 | 特開2021-055767 | 玉軸受 | 2021-07-02 |
| 14 | 特開2019-206986 | 転がり軸受及び転がり軸受の製造方法 | 2021-06-24 |
Top Patents/Patent Applications with the Highest Number of Protested
Of the patent applications filed in the last 10 years (2014-05-01 to 2024-04-30), 37 patents/patent applications were protest more than once in the examination process of other patent applications. The mean of the number of protest is 1.1. The most protest patent is 特表2023-512306 "トライボロジーシステム" (2 times) , and the next most protest patent is 特許6736018 "低摩擦被膜製造方法" (2 times) .
| - | No. | Title | |
|---|---|---|---|
| 1 | 特表2023-512306 | トライボロジーシステム | 2 times |
| 2 | 特許6736018 | 低摩擦被膜製造方法 | 2 times |
| 3 | 特許6677714 | 窒化珪素焼結体およびそれを用いた高温耐久性部材 | 2 times |
| 4 | 特開2021-188637 | 軸受装置 | 2 times |
| 5 | 特開2021-004660 | 軸受および減速機 | 2 times |
Inspectioned cases
List of latest Inspectioned patents
In the last 3 years (2021-05-01 ~ 2024-04-30), there were 19 patents Inspection from third parties. The average number of Inspection is 1.5 times. The most recently Inspection patent is 特開2021-188637 "軸受装置" (Inspection day 2024-03-11) , next is 特許4432764 "磁気エンコーダの製造方法及び車輪支持用転がり軸受ユニットの製造方法" (Inspection day 2023-11-01) .
| - | No. | Title | Inspection days |
|---|---|---|---|
| 1 | 特開2021-188637 | 軸受装置 | 2024-03-11 |
| 2 | 特許4432764 | 磁気エンコーダの製造方法及び車輪支持用転がり軸受ユニットの製造方法 | 2023-11-01 |
| 3 | 特開2021-004660 | 軸受および減速機 | 2023-10-04 |
| 4 | 特表2023-512306 | トライボロジーシステム | 2023-08-24 |
| 5 | 特許5186582 | 転がり軸受 | 2023-07-19 |
| 6 | 特開2022-048986 | かしめアセンブリの製造方法、ハブユニット軸受の製造方法、かしめ装置、かしめアセンブリ、及び車両の製造方法 | 2023-03-14 |
| 7 | 特開2022-134633 | 車輪用軸受装置 | 2023-03-13 |
| 8 | 特許7476850 | ハブユニット軸受の製造方法及び車両の製造方法 | 2023-01-27 |
| 9 | 特開2021-099155 | ハブユニット軸受 | 2023-01-23 |
| 10 | 特開2022-135326 | 偏心揺動型減速装置 | 2022-12-06 |
| 11 | 特開2022-076505 | 転がり軸受 | 2022-10-24 |
| 12 | 特許7369511 | シール付玉軸受 | 2022-09-27 |
| 13 | 特許7218242 | 導電性グリース組成物 | 2022-08-31 |
| 14 | 特開2019-206986 | 転がり軸受及び転がり軸受の製造方法 | 2022-04-08 |
| 15 | 特許7255541 | 揺動加工装置、揺動加工方法、ハブユニット軸受の製造方法および自動車の製造方法 | 2022-01-28 |
| 16 | 特開2021-055767 | 玉軸受 | 2022-01-19 |
| 17 | 特許7401990 | 玉軸受 | 2022-01-19 |
| 18 | 特許3964926 | 転がり装置、及びその製造方法 | 2021-11-29 |
| 19 | 特許7071801 | 転がり軸受及びそれを備えた軸受構造 | 2021-11-09 |
Top Patents/Patent Applications with the Highest Number of Inspectioned
Of the patent applications filed in the last 10 years (2014-05-01 to 2024-04-30), 49 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2021-004660 "軸受および減速機" (3 times) , and the next most inspection patent is 特許6523728 "軸受装置" (2 times) .
| - | No. | Title | |
|---|---|---|---|
| 1 | 特開2021-004660 | 軸受および減速機 | 3 times |
| 2 | 特許6523728 | 軸受装置 | 2 times |
| 3 | 特許6736018 | 低摩擦被膜製造方法 | 2 times |
| 4 | 特開2021-188637 | 軸受装置 | 2 times |
| 5 | 特許6432338 | 波動減速機用の玉軸受 | 2 times |
Cited cases
Top Patents/Patent Applications with the Highest Number of Cited
Of the patent applications filed in the last 10 years (2014-05-01 to 2024-04-30), 1,141 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6759751 "回転検出装置及びセンサ付きケーブル" (14 times) , and the next most cited patent is 特許6771739 "密封構造" (11 times) .
| - | No. | Title | |
|---|---|---|---|
| 1 | 特許6759751 | 回転検出装置及びセンサ付きケーブル | 14 times |
| 2 | 特許6771739 | 密封構造 | 11 times |
| 3 | 特許6753752 | 自転車用電動モータの支持構造およびこれを含む自転車用ドライブユニット | 10 times |
| 4 | 特開2018-179180 | 風力発電装置における主軸受のシール構造、風力発電装置用軸受および風力発電装置用軸受ユニット | 10 times |
| 5 | 特許6577184 | 転がり軸受 | 9 times |
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