CA190141A - Blackboard - Google Patents

Blackboard

Info

Publication number
CA190141A
CA190141A CA000190141A CA190141DA CA190141A CA 190141 A CA190141 A CA 190141A CA 000190141 A CA000190141 A CA 000190141A CA 190141D A CA190141D A CA 190141DA CA 190141 A CA190141 A CA 190141A
Authority
CA
Canada
Prior art keywords
blackboard
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
CA000190141A
Other languages
French (fr)
Inventor
Tom Mellor
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
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Application granted granted Critical
Publication of CA190141A publication Critical patent/CA190141A/en
Expired legal-status Critical Current

Links

CA000190141A 1918-11-02 1918-11-02 Blackboard Expired CA190141A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA190141T 1918-11-02

Publications (1)

Publication Number Publication Date
CA190141A true CA190141A (en) 1919-05-06

Family

ID=45309792

Family Applications (1)

Application Number Title Priority Date Filing Date
CA000190141A Expired CA190141A (en) 1918-11-02 1918-11-02 Blackboard

Country Status (1)

Country Link
CA (1) CA190141A (en)

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