Assertion: mechanical pencil | /r/ObjectUse | used in 18th century
Facets:
value: with many designs
type: OTHER
Source sentences:
text: Mechanical pencils were first used in the 18th century, with many designs patented in the 19th and 20th centuries.
text: Mechanical pencils were first used in the 18th century with many designs patented in the 19th and 20th centuries.