Weighing balances screws or timing watches on milligram balance, 1936

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Photo credit: © PF-(usna) / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: .., 1936, archives, depression, great, hine, historic, history, lancaster, lewis, lewishine, nara:arcid=518440, national, pennsylvania, thegreatdepression, usa, usnationalarchives