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United States Patent office workers looking through collection of over 2,000,000 patents circa 1940 .
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United States Patent office workers looking throug...

Employees in the patent office file room circa 1940.
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Employees in the patent office file room circa 194...

Patent Office employee pointing to copies of first patent granted after 1836 when patent laws were rewritten circa 1940.
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Patent Office employee pointing to copies of first...