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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Summary
United States patent 3118022 of first foil electret microphone (electroacoustic transducer), invented by G. M. Sessler and J. E. West at Bell Laboratories in 1962.
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 07:19, 9 January 2017 | | 3,964 × 1,958 (207 KB) | 127.0.0.1 (talk) | <p>United States patent 3118022 of first foil electret microphone (electroacoustic transducer), invented by G. M. Sessler and J. E. West at Bell Laboratories in 1962. </p> |
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