B - Operations – Transporting – 25 – B
Patent
B - Operations, Transporting
25
B
B25B 13/50 (2006.01) E21B 19/16 (2006.01)
Patent
CA 2464873
A power tong having an improved piston and cylinder assembly comprising retraction springs that are located inside the cylinder.
Bangert Daniel S.
Borden Ladner Gervais Llp
LandOfFree
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