Brown binocular film viewer made of phenol formald
Plastics and Modern Materials
1920-1940
Brown binocular film viewer made of phenol formaldehyde, with original box, with "Tru-Vue" on the front and the rear, and U.S. PAT 90564 on objective, made by TRU-VUE, Inc., Rock Island, Illinois, U.S.A., 1920-1940