Image: Wingquist patent PRV 25406 1907b

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Description: Sven Wingquist patent drawing, PRV (Patent office Sweden), patent no. 25406 for the multirow self alining ball bearing, 1907.
Title: Wingquist patent PRV 25406 1907b
Credit: File:Swedish patent 25406 Anordning vid kullager.pdf
Author: Sven Wingquist
Permission: This Swedish photograph is in the public domain in Sweden because one of the following applies: The work is non-artistic (journalistic, etc.) and has been created before 1 January 1972 (SFS 1960:729, § 49a). The photographer is not known, and cannot be traced, and the work has been created before 1 January 1952 (SFS 1960:729, § 44). If the photographer died before 1952, Template:PD-old-70 should be used instead of this tag.
Usage Terms: Public domain
License: Public domain
Attribution Required?: No

Image usage

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Bearing (mechanical)

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