ARMY MIL-M-48559A
ARMY ML-M-48559A 1990-MAR-30 MOUNT TELESCOPE AND QUADRANT M172
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This specification covers one type of telescope and quadrant mount which supports the Fire Control Quadrant: M18 and gives elevation compensation to correct for cant when the mount is leveled by a cross level movement. The mount also supports and aligns the mounting bracket for the Elbow Telescope: M138.