CA276844A - Methode a miner le charbon - Google Patents

Methode a miner le charbon

Info

Publication number
CA276844A
CA276844A CA276844A CA276844DA CA276844A CA 276844 A CA276844 A CA 276844A CA 276844 A CA276844 A CA 276844A CA 276844D A CA276844D A CA 276844DA CA 276844 A CA276844 A CA 276844A
Authority
CA
Canada
Prior art keywords
coal mining
mining method
coal
mining
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
CA276844A
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 CA276844A publication Critical patent/CA276844A/fr
Expired legal-status Critical Current

Links

CA276844A Methode a miner le charbon Expired CA276844A (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA276844T

Publications (1)

Publication Number Publication Date
CA276844A true CA276844A (fr) 1928-01-03

Family

ID=35209935

Family Applications (1)

Application Number Title Priority Date Filing Date
CA276844A Expired CA276844A (fr) Methode a miner le charbon

Country Status (1)

Country Link
CA (1) CA276844A (fr)

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