Assertion: disc's groove | /r/HasProperty | long-playing
Facets:
value: with a 55-micron groove
type: OTHER
Source sentences:
text: Monophonic records may be standard (reproducing sound when the disc is turned at 78 rpm; the groove is 140 microns wide) or long-playing (45, 33⅓13;, and 16 rpm, with a 55-micron groove).