English: William Chester Ruth (1882–1971), African American machinist and inventor, photographed holding a piece of his latest invention for Ebony magazine in 1950. Original caption reads: "Newest invention for Ruth is a 'secret weapon' which he keeps a mystery, saying: 'It's just something for airplanes.' Part shown here is only part he allowed to be photographed."
Date
Source
"Inventor Businessman: Ex-farmer makes and sells $50,000 worth of his own machinery inventions each year," Ebony Magazine (October 1950), vol. 5, issue 12, p. 91, https://archive.org/details/sim_ebony_1950-10_5_12
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.
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