MIL-T-45658F, MILITARY SPECIFICATION: TELESCOPE, STRAIGHT, M103 (22-JUN-1973) [NO S/S DOCUMENT]

MIL-T-45658F, MILITARY SPECIFICATION: TELESCOPE, STRAIGHT, M103 (22-JUN-1973) [NO S/S DOCUMENT]., This specification covers one type of three-power telescope with a ten-degree field of view. A level vial, positioned at the focal plane of the eyepiece provides for indicating proper orientation of the reticle patter.