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U.S. Patent Office, Washington DC, USA, National Photo Company, July 1925
GLS18A05_165

U.S. Patent Office, Washington DC, USA, National P...

Employees in Patent Office File Room, Washington DC, USA, Harris & Ewing, 1940
GLS18A06_457

Employees in Patent Office File Room, Washington D...

Employees Filing Patents, Patent Office, Washington DC, USA, Harris & Ewing, 1940
GLS18A06_458

Employees Filing Patents, Patent Office, Washingto...