AIR FORCE MIL-PRF-25620D
AR FORCE ML-PRF-25620D 1997-APR-21 TESTER OXYGEN MASK HEADSET AND MCROPHONE TYPE MQ-1A
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This specification covers one type of portable tester for pre-flight check of pressure demand oxygen masks and personal intercom equipment and EEU-2P goggles. The tester is designated type MQ-1A.