NAVY MIL-M-85831
NAVY ML-M-85831 1989-NOV-06 MASK HELCOPTER ARCREWMAN CHEMCAL BOLOGCAL RADOLOGCAL PROTECTVE NON-OXYGEN
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This specification establishes the requirements for the manufacture and acceptance of a mask to be used with and form part of the Protective Assembly, Helicopter Aircrewman, Chemical, Biological, Radiological (PASS).