Assertion: gray's caveat | /r/HasProperty | filed in the patent office
Facets:
value: during the weekend of february
type: TEMPORAL
value: according to evenson
type: OTHER
Source sentences:
text: According to Evenson, during the weekend of February 12–14, 1876, before either caveat or application had been filed in the patent office, Bell's lawyer learned about the liquid transmitter idea in Gray's caveat that would be filed early Monday morning February 14.