MIL-H-83511 (SUPPLEMENT-1), MILITARY SPECIFICATION: HEADSET-MICROPHONE AND HEADSET-ELECTRICAL (MEDIUM NOISE ATTENUATION, HEARING PROTECTIVE), GENERAL SPECIFICATION FOR (04-APR-1978) [S/S BY MIL-DTL-835AAA]

MIL-H-83511 (SUPPLEMENT-1), MILITARY SPECIFICATION: HEADSET-MICROPHONE AND HEADSET-ELECTRICAL (MEDIUM NOISE ATTENUATION, HEARING PROTECTIVE), GENERAL SPECIFICATION FOR (04-APR-1978) [S/S BY MIL-DTL-835AAA].