Assertion: electronic blackboard eraser | /r/HasProperty | operated at low noise level
Facets:
Source sentences:
text: The electronic blackboard eraser thus constructed is easy to assemble, and provides dual effect for erasing and dust collecting, and may be operated at a low noise level.
text: The electronic blackboard eraser thus constructed is easy to assemble, and provides dual effect for erasing and dust collecting, and may be operated at a low noise level.