This work is in the public domain in the United States because it was published in the United States between 1929 and 1977, inclusive, without a copyright notice. For further explanation, see Commons:Hirtle chart as well as a detailed definition of "publication" for public art. 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 (50 p.m.a.), Mainland China (50 p.m.a., not Hong Kong or Macao), Germany (70 p.m.a.), Mexico (100 p.m.a.), Switzerland (70 p.m.a.), and other countries with individual treaties.
Actress and photographer Grace Voss Frederick (right) demonstrates the Threeplex machine to Sy Felt (left) and Jesse Stay, director of Media Productions at BYU
Uploaded a work by Brigham Young University from [https://archive.org/details/dailyuniverse3048asso/page/n5/mode/1up BYU movie studio given unique gift] ''Daily Universe'' November 3, 1976, page 6; also available as [https://newspaperarchive.com/celebrity-clipping-nov-01-1976-3222479/ "Film Machine Donated to 'Y'], ''Provo Daily Herald'', November 1, 1976, page 4 (also with no notice) with UploadWizard
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