E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
254/20, 255/35
E21B 7/02 (2006.01) E21C 11/02 (1980.01)
Patent
CA 1065838
ABSTRACT OF THE DISCLOSURE A drill wagon has oscillatable crawler frames. Each crawler frame has a hydraulic ground engaging support jack at one end.
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LandOfFree
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