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RCA BTP1A
This is an RCA crystal/piezoelectric microphone with an unknown polar response and unknown date of manufacture.
RCA KB2A
This is an RCA ribbon/velocity microphone with a bi-directional polar response that was manufactured circa 1946.
RCA KB2C
This is an RCA ribbon/velocity microphone with a bi-directional polar response that was manufactured circa 1946.
RCA KB3A
This is an RCA ribbon/velocity microphone with a bi-directional polar response that was manufactured circa 1946.
RCA KN1A
This is an RCA ribbon/velocity microphone with an unknown polar response that was manufactured circa 1948.
RCA KU3A
This is an RCA ribbon/velocity microphone with a cardioid polar response. It was manufactured circa 1948.
RCA MI-3027E
This is an RCA ribbon/velocity microphone with a bi-directional polar response with an unknown date of manufacture.
RCA MI10004
This is an RCA microphone with unknown type and polar response. It was manufactured circa 1958.
RCA MI12016G
This is an RCA microphone with unknown type and polar response. It was manufactured circa 1951.
RCA MI12020
This is an RCA dynamic/moving coil microphone with an unknown polar response. Its date of manufacture is unknown.