U.S. patents covering time keeping mechanisms

APA Citation
United States. Patent Office. (1923). U.S. patents covering time keeping mechanisms. U.S. Patent Office. Retrieved from 10.5479/sil.490825.39088008027344

MLA Citation
United States. Patent Office. U.S. patents covering time keeping mechanisms. U.S. Patent Office, 1923, 10.5479/sil.490825.39088008027344

Chicago
United States. Patent Office. U.S. patents covering time keeping mechanisms. U.S. Patent Office, 1923. doi: 10.5479/sil.490825.39088008027344

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