Image: US Patent 3118022 - Gerhard M. Sessler James E. West - Bell labs - electroacustic transducer - foil electret condenser microphone 1962 1964 - pages 1-3
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Description: 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.
Title: US Patent 3118022 - Gerhard M. Sessler James E. West - Bell labs - electroacustic transducer - foil electret condenser microphone 1962 1964 - pages 1-3
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