MIL-B-13656B, MILITARY SPECIFICATION: BINOCULAR, M15A1 AND M17A1 (18-MAR-1964) [NO S/S DOCUMENT]

MIL-B-13656B, MILITARY SPECIFICATION: BINOCULAR, M15A1 AND M17A1 (18-MAR-1964) [NO S/S DOCUMENT]., This specification covers 7 X 50 binoculars. These binoculars are essentially identical except for a reticle in Binocular M17A1, which is used for the approximate measurement of small angles.