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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![File:US Patent 3118022 - Gerhard M. Sessler James E. West - Bell labs - electroacustic transducer - foil electret condenser microphone 1962 1964 - pages 1-3.png](https://upload.wikimedia.org/wikipedia/commons/thumb/a/ad/US_Patent_3118022_-_Gerhard_M._Sessler_James_E._West_-_Bell_labs_-_electroacustic_transducer_-_foil_electret_condenser_microphone_1962_1964_-_pages_1-3.png/800px-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 | 13:04, 1 September 2007 | ![]() | 3,964 × 1,958 (207 KB) | wikimediacommons>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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