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CA449726A - Fermeture de la gorge de protecteur de poussiere - Google Patents

Fermeture de la gorge de protecteur de poussiere

Info

Publication number
CA449726A
CA449726A CA449726A CA449726DA CA449726A CA 449726 A CA449726 A CA 449726A CA 449726 A CA449726 A CA 449726A CA 449726D A CA449726D A CA 449726DA CA 449726 A CA449726 A CA 449726A
Authority
CA
Canada
Prior art keywords
dust guard
well closure
guard well
closure
dust
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
CA449726A
Other languages
English (en)
Inventor
Armstrong Ernest
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 CA449726A publication Critical patent/CA449726A/fr
Expired legal-status Critical Current

Links

CA449726A Fermeture de la gorge de protecteur de poussiere Expired CA449726A (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA449726T

Publications (1)

Publication Number Publication Date
CA449726A true CA449726A (fr) 1948-07-13

Family

ID=35567437

Family Applications (1)

Application Number Title Priority Date Filing Date
CA449726A Expired CA449726A (fr) Fermeture de la gorge de protecteur de poussiere

Country Status (1)

Country Link
CA (1) CA449726A (fr)

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