Assertion: drum's size | /r/HasProperty | large
Facets:
value: at that time
type: TEMPORAL
value: as small guitar amp head
type: OTHER
Source sentences:
text: In the early 1960s, a home organ manufacturer, Gulbransen (later acquired by Fender) cooperated with an automatic musical equipment manufacturer Seeburg Corporation, and released early compact rhythm machines Rhythm Prince (PRP), although, at that time, these size were still as large as small guitar amp head, due to the use of bulky electro-mechanical pattern generators.