Positive drive mechanism

作者: Robert K Little

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参考文章(7)
Herman C Sauer, Toothed belt with grooved teeth ,(1959)
Edgar Rice, Stanley Handelman, Worm and wheel unit ,(1961)
Zychlinski Bruno Von, Berg Herbert, Friction element for power transmission ,(1937)
Donald E Davidson, Elevator for tripod ,(1954)