CA638892A - Earth borehole drilling apparatus and system - Google Patents

Earth borehole drilling apparatus and system

Info

Publication number
CA638892A
CA638892A CA638892A CA638892DA CA638892A CA 638892 A CA638892 A CA 638892A CA 638892 A CA638892 A CA 638892A CA 638892D A CA638892D A CA 638892DA CA 638892 A CA638892 A CA 638892A
Authority
CA
Canada
Prior art keywords
drilling apparatus
borehole drilling
earth borehole
earth
drilling
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
CA638892A
Inventor
H. Pfefferle George
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dresser Industries Inc
Original Assignee
Dresser Industries Inc
Publication date
Application granted granted Critical
Publication of CA638892A publication Critical patent/CA638892A/en
Expired legal-status Critical Current

Links

CA638892A Earth borehole drilling apparatus and system Expired CA638892A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA638892T

Publications (1)

Publication Number Publication Date
CA638892A true CA638892A (en) 1962-03-27

Family

ID=35917402

Family Applications (1)

Application Number Title Priority Date Filing Date
CA638892A Expired CA638892A (en) Earth borehole drilling apparatus and system

Country Status (1)

Country Link
CA (1) CA638892A (en)

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