AU439507B2 - Retractable drill bits - Google Patents

Retractable drill bits

Info

Publication number
AU439507B2
AU439507B2 AU14675/70A AU1467570A AU439507B2 AU 439507 B2 AU439507 B2 AU 439507B2 AU 14675/70 A AU14675/70 A AU 14675/70A AU 1467570 A AU1467570 A AU 1467570A AU 439507 B2 AU439507 B2 AU 439507B2
Authority
AU
Australia
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
AU14675/70A
Other versions
AU1467570A (en
Inventor
KLAUS GRILL and HOWARD DANIEL LINK WERNER
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
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Christensen Diamond Products Co filed Critical Christensen Diamond Products Co
Application granted granted Critical
Publication of AU439507B2 publication Critical patent/AU439507B2/en
Publication of AU1467570A publication Critical patent/AU1467570A/en
Expired legal-status Critical Current

Links

AU14675/70A 1969-10-03 1970-05-05 Retractable drill bits Expired AU439507B2 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
USUS863,659 1969-10-03

Publications (2)

Publication Number Publication Date
AU439507B2 true AU439507B2 (en) 1971-11-11
AU1467570A AU1467570A (en) 1971-11-11

Family

ID=

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