Ceiling light projectors ML-121-A, B, C, E, F and G

Army · TM 11-421 · 1943 · 43 pages

Describes, operates, and maintains Ceiling Light Projectors ML-121-A through ML-121-G, used to measure cloud-ceiling height.

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Free 72-hour kit. A short checklist PDF for the first three days, if you want a next step after this manual.

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