Assertion: bobbin | /r/HasProperty | round
Facets:
value: upon magnet wire
type: LOCATION
Source sentences:
text: Bobbins are difficult to store because they are small and round; if not properly stored, the thread on each bobbin begins to unwind, creating a mass of knotted thread.
text: A bobbin can be round or rectangular upon magnet wire is wound to a desired number of turns.