CA385917A - Fabrication de tableaux noirs - Google Patents

Fabrication de tableaux noirs

Info

Publication number
CA385917A
CA385917A CA385917A CA385917DA CA385917A CA 385917 A CA385917 A CA 385917A CA 385917 A CA385917 A CA 385917A CA 385917D A CA385917D A CA 385917DA CA 385917 A CA385917 A CA 385917A
Authority
CA
Canada
Prior art keywords
blackboard
manufacture
blackboard manufacture
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
CA385917A
Other languages
English (en)
Inventor
C. Macildowie John
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.)
Johns Manville Corp
Original Assignee
Johns Manville Corp
Publication date
Application granted granted Critical
Publication of CA385917A publication Critical patent/CA385917A/fr
Expired legal-status Critical Current

Links

CA385917A Fabrication de tableaux noirs Expired CA385917A (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA385917T

Publications (1)

Publication Number Publication Date
CA385917A true CA385917A (fr) 1939-12-26

Family

ID=35391139

Family Applications (1)

Application Number Title Priority Date Filing Date
CA385917A Expired CA385917A (fr) Fabrication de tableaux noirs

Country Status (1)

Country Link
CA (1) CA385917A (fr)

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