Assertion: class d amplifier | /r/HasProperty | called by that name
Facets:
value: in 1955
type: TEMPORAL
Source sentences:
text: The first Class-D amplifier was invented by British scientist Alec Reeves in the 1950s and was first called by that name in 1955.
text: The first Class-D amplifier was invented by British scientist Alec Reeves in the 1950s and was first called by that name in 1955.