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 TM 9-1240-375-34&P
DIRECT SUPPORT AND GENERAL SUPPORT
THEORY OF OPERATION
PURPOSE
The fire control equipment instruments provide radioactive and battery-powered sighting capability for the
155-mm howitzer. The M17/M17A1 and M18/M18A1 fire control quadrants measure elevation of the
cannon. The M137/M137A2/M137A3 and M138/M138A1 telescopes provide a means of measuring
horizontal direction in indirect or direct fire operations. The M171/M171A1 and M172/M172A1 mounts
provide a mount for the fire control quadrants and the telescopes.
END OF WORK PACKAGE
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