Assertion: carbon microphone | /r/ObjectUse | used in telephone
Facets:
value: widely
type: DEGREE
value: until the 1980s
type: TEMPORAL
value: from 1890
type: TEMPORAL
value: for over one hundred years
type: TEMPORAL
value: once commonly
type: TEMPORAL
Source sentences:
text: Carbon microphones were once commonly used in telephones; they have extremely low-quality sound reproduction and a very limited frequency response range but are very robust devices.
text: Carbon microphones were used in telephones for over one hundred years.
text: Carbon microphones were widely used in telephones from 1890 until the 1980s.