File:US Patent 3118022 - Gerhard M. Sessler James E. West - Bell labs - electroacustic transducer - foil electret condenser microphone 1962 1964 - pages 1-3.png
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current | 09:04, 1 September 2007 | 3,964 × 1,958 (207 KB) | commons>Archicomm | {{Information |Description=United States patent 3118022 of first foil electret microphone (electroacustic transducer), invented by G. M. Sessler and J. E. West at Bell Laboratories in 1962. |Source=Originally from [http://en.wikipedia.org en.wikipedia]; d |
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