4 media by topic ∙ page 1 of 1
Frank S. Betz Co., (Optical Instruments, etc.,) Hammond, Ind. Very few...
Picryl description: Public domain image of girl workers, child labor, working children, economic conditions, free to use, no copyright restrictions.
Far-sighted Army eyes. Assembly of standard field glasses for the Army...
Public domain photograph of laboratory, scientist, free to use, no copyright restrictions image - Picryl description
Mukden, Manchuria: Japanese Optical Goods Factory
Guard box in portion of factory from which machinery was removed during Soviet occupancy, with inscription in Russian. Photoprint by Capt. Marlin Fenical of the U.S. Army Signal Corps. This record contains unve... More
American Photoengravers Association convention. C.P. Goerz Optical Co....
Public domain photograph of industrial architecture, factory building, free to use, no copyright restrictions image - Picryl description