File:The Klystron boys, Radio's miracle makers in Saturday Evening Post Feb 8, 1941.pdf

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English: Image of an article in The Saturday Evening Post of February 8, 1941 describing the invention of the Klystron tube and the Varian brothers behind it, along with their coinventors.
Source The Saturday Evening Post, February 2, 1941, volume 213, issue 32
Author Frank J. Taylor


Public domain
This work is in the public domain because it was published in the United States between 1924 and 1963 and although there may or may not have been a copyright notice, the copyright was not renewed. Unless its author has been dead for the required period, it is copyrighted in the countries or areas that do not apply the rule of the shorter term for US works, such as Canada (50 pma), Mainland China (50 pma, not Hong Kong or Macao), Germany (70 pma), Mexico (100 pma), Switzerland (70 pma), and other countries with individual treaties. See Commons:Hirtle chart for further explanation.

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I searched the US govt. copyright records renewal site ( and found the publication "The Saturday Evening Post" had renewed its copyrights from April 1, 1950 but not before. The search was for "The Saturday Evening Post" with the "Resort results by:" field set to "(Date) ascending." I went through quite a few of the initial pages to make sure nothing was missed (the years did go up). Considering that 5104 entries were shown, the search is accurate; the publication opted not to renew copyrights prior to 1950, and so they are now in the public domain.

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