Electret condenser microphone

Electret condenser microphone

Electret condenser microphone

Electret condenser microphone

Electret condenser microphone and method of producing same

Electret condenser microphone and method of producing same

Electret condenser microphone unit

Electret covered with an insulated film and an electret...

Electret microphone

Electret microphone

Electret microphone

Electret microphone assembly, and method of manufacturer

Electret transducer array and fabrication technique

Electretization method and apparatus

Electric acoustic converter

Electric acoustic converter having a rear surface terminal

Electric sound converter

Electric-acoustic transducer having dual voice coil drivers

Electric-acoustic transducer having moving magnet and...

Electric-mechanical-acoustic converter and method for...