Screw holder and driver
作者： Paul E Helms
DOI:
关键词:
摘要:
lens.org 参考文章(3)
Floyd C Snyder, Mechanism including a driven tool for feeding and operating upon work elements ,(1938)
Ray E Kellogg, Portable power-driven screw driver ,(1939)
Clinton L Graybill, Power driven screw driver ,(1955)