Assertion: radial gear | /r/HasProperty | invented by arab engineer al-jazari
Facets:
value: in 1206
type: TEMPORAL
Source sentences:
text: The segmental gear, which receives/communicates reciprocating motion from/to a cogwheel, consisting of a sector of a circular gear/ring having cogs on the periphery, was invented by Arab engineer Al-Jazari in 1206.