CA299754A - Perforatrice a charbon - Google Patents

Perforatrice a charbon

Info

Publication number
CA299754A
CA299754A CA299754A CA299754DA CA299754A CA 299754 A CA299754 A CA 299754A CA 299754 A CA299754 A CA 299754A CA 299754D A CA299754D A CA 299754DA CA 299754 A CA299754 A CA 299754A
Authority
CA
Canada
Prior art keywords
drilling apparatus
coal drilling
coal
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
CA299754A
Other languages
English (en)
Inventor
D. Levin Nils
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.)
Jeffrey Manufacturing Co
Original Assignee
Jeffrey Manufacturing Co
Publication date
Application granted granted Critical
Publication of CA299754A publication Critical patent/CA299754A/fr
Expired legal-status Critical Current

Links

CA299754A Perforatrice a charbon Expired CA299754A (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA299754T

Publications (1)

Publication Number Publication Date
CA299754A true CA299754A (fr) 1930-04-29

Family

ID=35237073

Family Applications (1)

Application Number Title Priority Date Filing Date
CA299754A Expired CA299754A (fr) Perforatrice a charbon

Country Status (1)

Country Link
CA (1) CA299754A (fr)

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