Assertion: air caster | /r/HasProperty | invented by harry a mackie
Facets:
value: in december
type: TEMPORAL
Source sentences:
text: The air caster (originally called the air bearing) was invented by Harry A Mackie in December 1961 as the “pendant air bearing load supporting device” for General Motors Corporation as an alternative to the overhead crane, which ran opposed to a rail, creating friction free movement.