Assertion: pencil | /r/HasProperty | introduced by different manufacturers
Facets:
value: to distinguish their products
type: PURPOSE
Source sentences:
text: American-made pencils can often be found with numerically equivalent designations of 2-1/2, 2-4/8, 2-5/10, and 2.5, representing the same grade, but introduced by different manufacturers to distinguish their products and to avoid patent lawsuits.