Assertion: black lead pencil | /r/CapableOf | exhibit at the centennial
Facets:
value: in philadelphia
type: LOCATION
value: in 1876
type: TEMPORAL
Source sentences:
text: Wielandy (p. 67) states that "All the black lead pencils exhibited at the Centennial in Philadelphia in 1876 contained square leads, and it is said that Joseph Dixon Crucible Company was among the first manufacturers of pencils to use round leads, making the change shortly after the Centennial year.