CA415983A - Machine a frotter ou a nettoyer les tableaux noirs - Google Patents

Machine a frotter ou a nettoyer les tableaux noirs

Info

Publication number
CA415983A
CA415983A CA415983A CA415983DA CA415983A CA 415983 A CA415983 A CA 415983A CA 415983 A CA415983 A CA 415983A CA 415983D A CA415983D A CA 415983DA CA 415983 A CA415983 A CA 415983A
Authority
CA
Canada
Prior art keywords
abrading
blackboard
clearing machine
clearing
machine
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
CA415983A
Other languages
English (en)
Inventor
A. Swan Harold
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 CA415983A publication Critical patent/CA415983A/fr
Expired legal-status Critical Current

Links

CA415983A Machine a frotter ou a nettoyer les tableaux noirs Expired CA415983A (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA415983T

Publications (1)

Publication Number Publication Date
CA415983A true CA415983A (fr) 1943-10-26

Family

ID=35525197

Family Applications (1)

Application Number Title Priority Date Filing Date
CA415983A Expired CA415983A (fr) Machine a frotter ou a nettoyer les tableaux noirs

Country Status (1)

Country Link
CA (1) CA415983A (fr)

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