CA470961A - Ciels de houilleres ou autres chantiers - Google Patents

Ciels de houilleres ou autres chantiers

Info

Publication number
CA470961A
CA470961A CA470961A CA470961DA CA470961A CA 470961 A CA470961 A CA 470961A CA 470961 A CA470961 A CA 470961A CA 470961D A CA470961D A CA 470961DA CA 470961 A CA470961 A CA 470961A
Authority
CA
Canada
Prior art keywords
colliery
workings
roofs
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
CA470961A
Other languages
English (en)
Inventor
Sytse Beijl Zako
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 CA470961A publication Critical patent/CA470961A/fr
Expired legal-status Critical Current

Links

CA470961A Ciels de houilleres ou autres chantiers Expired CA470961A (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA470961T

Publications (1)

Publication Number Publication Date
CA470961A true CA470961A (fr) 1951-01-23

Family

ID=35604906

Family Applications (1)

Application Number Title Priority Date Filing Date
CA470961A Expired CA470961A (fr) Ciels de houilleres ou autres chantiers

Country Status (1)

Country Link
CA (1) CA470961A (fr)

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