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The TMG-1 telephone microphone headset was supposedly produced since 1959 by the Tula Octave plant. Produced in two versions, with a low impedance and high impedance microphone. Designed to work in the equipment of long-distance telephone communication. Contains carbon microphone type "MK-60T" and telephone dynamic primer. The headset was used by linear lineers to check the line. The frequency range of the phone is 300 ... 3000 Hz. Non-uniformity of the CH 13 dB.