CA300454A - Opening and closing device for mine doors - Google Patents

Opening and closing device for mine doors

Info

Publication number
CA300454A
CA300454A CA300454A CA300454DA CA300454A CA 300454 A CA300454 A CA 300454A CA 300454 A CA300454 A CA 300454A CA 300454D A CA300454D A CA 300454DA CA 300454 A CA300454 A CA 300454A
Authority
CA
Canada
Prior art keywords
opening
closing device
mine doors
mine
doors
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
CA300454A
Other languages
French (fr)
Inventor
Smith Bryan
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 CA300454A publication Critical patent/CA300454A/en
Expired legal-status Critical Current

Links

CA300454A Opening and closing device for mine doors Expired CA300454A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA300454T

Publications (1)

Publication Number Publication Date
CA300454A true CA300454A (en) 1930-05-20

Family

ID=35237773

Family Applications (1)

Application Number Title Priority Date Filing Date
CA300454A Expired CA300454A (en) Opening and closing device for mine doors

Country Status (1)

Country Link
CA (1) CA300454A (en)

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