Keystone Stereoscopic Tester M1A1, Ophthalmic Tele Binocular (gleich Betrachter Nr. B469)
description: Keystone Stereoscopic Tester M1A1, Ophthalmic Tele Binocular (gleich Betrachter Nr. B469)
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
publisher: Keystone
format: 46,5 (B) x 43 (T) x 26 (H) cm
coverage: USA
coverage: 1935