CA416930A - Drilling apparatus - Google Patents

Drilling apparatus

Info

Publication number
CA416930A
CA416930A CA416930A CA416930DA CA416930A CA 416930 A CA416930 A CA 416930A CA 416930 A CA416930 A CA 416930A CA 416930D A CA416930D A CA 416930DA CA 416930 A CA416930 A CA 416930A
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
CA416930A
Other languages
French (fr)
Inventor
J. Bowan Walter
H. Mueller Frank
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.)
Individual
Original Assignee
Individual
Publication date
Application granted granted Critical
Publication of CA416930A publication Critical patent/CA416930A/en
Expired legal-status Critical Current

Links

CA416930A Drilling apparatus Expired CA416930A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA416930T

Publications (1)

Publication Number Publication Date
CA416930A true CA416930A (en) 1943-12-07

Family

ID=35526164

Family Applications (1)

Application Number Title Priority Date Filing Date
CA416930A Expired CA416930A (en) Drilling apparatus

Country Status (1)

Country Link
CA (1) CA416930A (en)

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