Assertion: lathe's bed | /r/HasProperty | truncated triangular prism
Facets:
Source sentences:
text: Two bed patterns are common: the WW (Webster Whitcomb) bed, a truncated triangular prism (found only on 8 and 10 mm watchmakers' lathes); and the continental D-style bar bed (used on both 6 mm and 8 mm lathes by firms such as Lorch and Star).