Assertion: gray | /r/CapableOf | apply for patent
Facets:
value: for the same invention
type: TRANSITIVE-OBJECT
value: in late 1877
type: TEMPORAL
value: on a harmonic telegraph
type: LOCATION
Source sentences:
text: Gray applied for a patent on a harmonic telegraph which consisted of multi-tone transmitters, that controlled each tone with a separate telegraph key.
text: Although Gray had abandoned his caveat, Gray applied for a patent for the same invention in late 1877.