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| Audio-Technica AT 4080 and 4081 |
Ty Ford (written sometime in 2005)
The BBC cites 1933 as the year pressure gradient ribbon microphones were introduced. It also notes that RCA's Harry Olson applied for a patent on January 31, 1941 that was granted May 9, 1944 for ribbon microphones that converted sound pressure to electrical energy using a strip of aluminum between two magnets.
