Image: Wingquist patent PRV 25406 1907

Description: Sven Wingquist patent drawing, PRV (Patent office Sweden), patent no. 25406 for the multirow self alining ball bearing, 1907. Photo copy of original drawing.
Title: Wingquist patent PRV 25406 1907
Credit: PRV archive drawing, patent no. 25407, 1907.
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, …) and has been created before 1969. The photographer is not known, and cannot be traced, and the work has been created before 1944. If the photographer died before 1947, Template:PD-old-70 should be used instead of this tag. You must also include a United States public domain tag to indicate why this work is in the public domain in the United States. Note that a few countries have copyright terms longer than 70 years: Mexico has 100 years, Jamaica has 95 years, Colombia has 80 years, and Guatemala and Samoa have 75 years. This image may not be in the public domain in these countries, which moreover do not implement the rule of the shorter term. Côte d'Ivoire has a general copyright term of 99 years and Honduras has 75 years, but they do implement the rule of the shorter term. Copyright may extend on works created by French who died for France in World War II (more information), Russians who served in the Eastern Front of World War II (known as the Great Patriotic War in Russia) and posthumously rehabilitated victims of Soviet repressions (more information).
Usage Terms: Public domain
License: Public domain
Attribution Required?: No