MIL-A-23899B, MILITARY SPECIFICATION: AURAL PROTECTOR, SOUND (17-AUG-1984) [S/S BY S/S by SAE-AS23899]

MIL-A-23899B, MILITARY SPECIFICATION: AURAL PROTECTOR, SOUND (17-AUG-1984) [S/S BY S/S by SAE-AS23899]., This specification covers the design and performance requirements of one type of sound aural protector.