Assertion: electric organ | /r/CapableOf | add built-in simpledrum machines
Facets:
value: in the 1970s
type: TEMPORAL
value: usually
type: TEMPORAL
Source sentences:
text: In the 1970s, electric organs added "play-along" features such as built-in (usually rather simple) drum machines, and the ability to play backing tracks from a built-in cassette tape player.