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MIL-T-11157 Revision B, September 6, 1963
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THEODOLITE, DOUBLE CENTER ML-474 ( )/GM
Includes all amendments and changes through Cancellation Notice 2, December 21, 1998
Additional Comments: CNCL NO S/S
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This specification covers one type of meteorological equipment used for tracking meteorological balloons to determine upper air wind velocity and direction, consisting of the following units and designated as Theodolite, Double Center ML-474( )/GM. (See 6.3.)

Main Telescope

Telescope ML-146()

Compass ML-197()

Case CY-787()/U