Assertion: electret microphone | /r/HasProperty | a type of condenser microphone
Facets:
Source sentences:
text: An electret microphone is a type of condenser microphone invented by Gerhard Sessler and Jim West at Bell laboratories in 1962.
text: Electret microphones used in cell phones and computers are a type of condenser microphone that use a polarized ferroelectric material.
text: An Electret microphone is a type of condenser microphone that comes with a permanent charge built into it.