TM-9-1240-400-34&P Technical Manual for M109 Telescopes and Mounts Download
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SECTION II TM 9-1240-400-34&P Figure B-5. Worm Assembly, Optical Instrument 8587400, Cell Assembly, Optical Instrument Collective 8587297, Cell Assembly, Optical Instrument Objective 8587296, and Reticle Assembly 8587375 - Exploded View.