B - Operations – Transporting – 21 – B
Patent
B - Operations, Transporting
21
B
77/28, 80/51
B21B 1/00 (2006.01) C21D 7/08 (2006.01) E21B 10/56 (2006.01)
Patent
CA 2009179
ABSTRACT OF THE DISCLOSURE An element to be used for percussive drilling to transmit impact energy in its axial direction is cold- worked along a surface thereof by being subjected to a deep rolling operation which creates a surface finish RA no greater than 1Ø
Gowling Lafleur Henderson Llp
Rystedt Anders
Sandvik Ab
LandOfFree
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