E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
255/89
E21B 21/06 (2006.01) B23Q 1/34 (2006.01) E21B 21/015 (2006.01) E21B 21/16 (2006.01)
Patent
CA 1309085
ABSTRACT OF THE DISCLOSURE A diverter apparatus for use in conjuction with earth drilling operations to divert cuttings from the area surrounding the bore hole, and including a pneumatically extensible and retractables ground-engaging skirt which surrounds the bore hole.
615375
Johnston Vaughn R.
Macrae & Co.
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