Assertion: known hamburger | /r/HasProperty | served on july
Facets:
Source sentences:
text: The family of Oscar Weber Bilby claim the first-known hamburger on a bun was served on July 4, 1891 on Grandpa Oscar's farm.
text: The family of Oscar Weber Bilby claim the first-known hamburger on a bun was served on July 4, 1891 on Grandpa Oscar’s farm.