CA898236A - Retractable drill bits - Google Patents

Retractable drill bits

Info

Publication number
CA898236A
CA898236A CA898236A CA898236DA CA898236A CA 898236 A CA898236 A CA 898236A CA 898236 A CA898236 A CA 898236A CA 898236D A CA898236D A CA 898236DA CA 898236 A CA898236 A CA 898236A
Authority
CA
Canada
Prior art keywords
drill bits
retractable drill
retractable
bits
drill
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
CA898236A
Inventor
K. Grill Werner
D. Link Howard
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.)
Norton Christensen Inc
Original Assignee
Christensen Diamond Products Co
Publication date
Application granted granted Critical
Publication of CA898236A publication Critical patent/CA898236A/en
Expired legal-status Critical Current

Links

CA898236A Retractable drill bits Expired CA898236A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA898236T

Publications (1)

Publication Number Publication Date
CA898236A true CA898236A (en) 1972-04-18

Family

ID=36404131

Family Applications (1)

Application Number Title Priority Date Filing Date
CA898236A Expired CA898236A (en) Retractable drill bits

Country Status (1)

Country Link
CA (1) CA898236A (en)

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