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U.S. patents covering time keeping mechanisms (1923)
United States. Patent Office · [Washington, D.C.] : U.S. Patent Office · leaf 1226
1,478,939 Dec. 25, 1923. R. J. CAVILLA EGG BOILER 2 Sheets-Sheet 2 Filed Oct. 30. 1922 … INVENTOR WITNESSES BY S2>. S^U-tyif. ATTORNEYSClocks and watches
Internet Archive · Smithsonian Libraries · Public domain (published before 1931). Free to use for anything.
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