Assertion: speaker's sound | /r/HasProperty | marketed in late 1950s
Facets:
value: as seeming "richer
type: CAUSE
value: originally
type: TEMPORAL
Source sentences:
text: Originally, in the late 1950s and 1960s, stereophonic sound was marketed as seeming "richer" or "fuller-sounding" than monophonic sound, but these sorts of claims were and are highly subjective, and again, dependent on the equipment used to reproduce the sound.