Assertion: mandible's surface | /r/HasAspect | four circular cavities
Facets:
Source sentences:
text: Further, the member ( 2 ) has on the top face thereof a permanent magnet ( 24 ), which is embedded at the center of the top face but some surface of which is exposed free, and has four circular cavities ( 25 ) arranged at four locations which are equally distant from the center and equally spaced in the circumferential direction.