Assertion: talc's use | /r/HasProperty | efficient
Facets:
Source sentences:
text: Tube or pebble mills with continuous feed and discharge may be necessary in the milling of fibrous talc or talc mixed with tremolite; they may also be economical with certain other talcs, but the use of three or four large tube mills in tandem with no screening or separation between the mills nor for the sizing of the finished product is neither efficient nor economical.