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The T-1 carbon microphone was originally designed as an electrical, mechanical and acoustical equivalent of Western Electric's model T-1.
Aluminum Vandal Resistant Grid Microphone, Xmit, Carbon.
Diameter: 1.814 Height: .540
Weight Grams: 33 ± 2
Sensitivity (DBv) -22 ± 4
Impedance (Ω): 65 ± 30