E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
255/17
E21B 7/00 (2006.01) E21B 7/02 (2006.01)
Patent
CA 1121796
ABSTRACT OF DISCLOSURE A portable earth drilling apparatus adapted for helicopter transportation has been designed in light modular form and particularly adapted for use at high elevations under circumstances where prior art drill rigs are not capable of efficient operation.
333761
Hignight Charles G.
Womack D. Gene
Georex Industries Inc.
Macrae & Co.
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