Assertion: blackboard eraser | /r/CapableOf | clean blackboard
Facets:
value: efficiently
type: MANNER
value: without permitting the particles of chalk
type: MANNER
Source sentences:
text: It will be obvious that a blackboard eraser made in accordance with this invention will efficiently clean a blackboard without permitting the particles of chalk removed from the board to fly about in the atmosphere of the room where the blackboard is located.