English: A Gorgon IV missile mounted on the wing of a P-61 Black Widow in preparation for flight testing. Public domain photograph from February 1949 issue of Popular Mechanics. This issue was not copyright renewed by the publisher and the entire issue is in the public domain.
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This work is in the public domain because it was published in the United States between 1929 and 1963, and although there may or may not have been a copyright notice, the copyright was not renewed. For further explanation, see Commons:Hirtle chart and the copyright renewal logs. Note that it may still be copyrighted in jurisdictions that do not apply the rule of the shorter term for US works (depending on the date of the author's death), such as Canada (70 years p.m.a.), Mainland China (50 years p.m.a., not Hong Kong or Macao), Germany (70 years p.m.a.), Mexico (100 years p.m.a.), Switzerland (70 years p.m.a.), and other countries with individual treaties.
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2010-08-20 21:45 John Chamberlain 614×303× (221289 bytes) Public domain photograph from February 1949 issue of Popular Mechanics. This issue was not copyright renewed by the publisher and the entire issue is in the public domain.
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