Automatic feed control for rock drills
作者： Richard W Beaumont
DOI:
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摘要:
lens.org 参考文章(3)
Albert J Carpenter, Drill head spindle drive construction ,(1955)
Stenuick Andre Pierre Camille, Drilling and similar machines ,(1956)
Ernest C Edwards, James M Bain, Portable horizontal earth drilling tool ,(1955)