CA411137A - Drilling apparatus - Google Patents

Drilling apparatus

Info

Publication number
CA411137A
CA411137A CA411137DA CA411137A CA 411137 A CA411137 A CA 411137A CA 411137D A CA411137D A CA 411137DA CA 411137 A CA411137 A CA 411137A
Authority
CA
Canada
Prior art keywords
drilling apparatus
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
Other languages
French (fr)
Inventor
Alfred Kurtze Harry
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.)
EJ Longyear Co
Original Assignee
EJ Longyear Co
Publication date
Application granted granted Critical
Publication of CA411137A publication Critical patent/CA411137A/en
Expired legal-status Critical Current

Links

CA411137D Drilling apparatus Expired CA411137A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA411137T

Publications (1)

Publication Number Publication Date
CA411137A true CA411137A (en) 1943-03-16

Family

ID=35422439

Family Applications (1)

Application Number Title Priority Date Filing Date
CA411137D Expired CA411137A (en) Drilling apparatus

Country Status (1)

Country Link
CA (1) CA411137A (en)

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