150514 ⎘
Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for conveying or interconverting oscillating or reciprocating motions; Screw mechanisms with balls, rollers, or similar members between the co-operating parts; Elements essential to the use of such members with rings engaging the screw shaft with the inner perimeter, e.g. using inner rings of a ball bearing
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