Assertion: phosphoric acid | /r/HasProperty | without exception
Facets:
value: heretofore
type: DEGREE
Source sentences:
text: Phosphoric acids used for industrial purposes have been heretofore, without exception, produced by the dry process, because phosphoric acid produced by the Wet process contains a great deal of impurities and, therefore, could only be used as a raw material for fertilizers and certain types of phosphate compounds.