Lot of 20 Vintage Movie Theater Polaroid 3D Cardboard Glasses Retro 1950

Lot of 20 Vintage Movie Theater Polaroid 3D Viewers Cardboard Glasses Retro 1950s These glasses are new, never worn, but they might show some imperfections due to decades of storage. Please see pictures. These are paper and polaroid lens with a bendable wire in frame to adhere to head. These were patented in 1941 thru 1945, several patents and were used in movie theaters in the early 1950's. Manufactured by POLAROID CORPORATION, Cambridge, 39, Mass. Patented U.S. Nos. 2,237,567; 2,328,219; 2.454,515; Re 23,297 Patented in Canada 1941, 1945 F-1317C. FAST shipping