EVALUATION OF GAS MASK FOR HELICOPTER PILOTS Open PDF Document Details Document Type Technical Report Publication Date Feb 03, 1956 Accession Number AD0101555 Tags Communities of Interest Air Platforms DTIC Thesaurus Topics Aeronautics Aircrafts Army Aircraft Contracts Engineering Flight Gas Masks Government Procurement Governments Helicopters Masks Microphones Protective Masks Radio Equipment Test And Evaluation United States United States Government