E - Fixed Constructions – 21 – C
Patent
E - Fixed Constructions
21
C
90/48, 255/72
E21C 25/10 (2006.01) B23D 47/08 (2006.01) B23D 47/12 (2006.01) B23Q 5/04 (2006.01) B23Q 11/00 (2006.01) B28D 1/04 (2006.01) E21B 10/12 (2006.01) E21C 25/18 (2006.01) E21D 9/10 (2006.01)
Patent
CA 1327196
ABSTRACT An apparatus for percussively milling slots in rock or the like includes a flat disk-like radial boring tool mounted on a drive shaft which is rotated slowly against the work while being driven percussively and radially outwardly toward the work in the neighborhood of, for example, forty times for every revolution of the tool.
587306
Bechem Klaus
Bechem Philip
Bechem Ulrich
Lenzen Dieter
Bechem Hannelore
Fetherstonhaugh & Co.
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