Keystone View Company Stereoscopic Tester M1A1, Ophthalmic Tele Binocular
description: Keystone View Company Stereoscopic Tester M1A1, Ophthalmic Tele Binocular
description: Zusatz : The device was very likely built for the Air force to test a pilots capacity of depth of field vision.
description: Material : Metall, lackiert
description: Bildart : Glas + Pappe
publisher: Keystone View Company
format: 46,5 (B) x 43 (T) x 26 (H) cm
coverage: Meadville
coverage: USA
coverage: 1935