U.S. patents covering time keeping mechanisms

APA Citation
United States. Patent Office. (1892). U.S. patents covering time keeping mechanisms. United States Patent Office. Retrieved from 10.5479/sil.490880.39088008063802

MLA Citation
United States. Patent Office. U.S. patents covering time keeping mechanisms. United States Patent Office, 1892, 10.5479/sil.490880.39088008063802

Chicago
United States. Patent Office. U.S. patents covering time keeping mechanisms. United States Patent Office, 1892. doi: 10.5479/sil.490880.39088008063802

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