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MICROPHONE M-7A/ELECTRET 09168P-33Model M-7 DC Headset Electret MicrophoneThis Electret Microphone is a noise canceling type designed to operate in place of carbon and amplified dynamic microphones. It will not operate in circuits that do not supply a DC bias voltage. Most modern aviation communicat..

Electret Microphone, M7A DC 09168P-33..