CA157539A - Blackboard - Google Patents

Blackboard

Info

Publication number
CA157539A
CA157539A CA000157539A CA157539DA CA157539A CA 157539 A CA157539 A CA 157539A CA 000157539 A CA000157539 A CA 000157539A CA 157539D A CA157539D A CA 157539DA CA 157539 A CA157539 A CA 157539A
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
CA000157539A
Other languages
French (fr)
Inventor
William H. Evers
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 CA157539A publication Critical patent/CA157539A/en
Expired legal-status Critical Current

Links

CA000157539A 1914-04-20 1914-04-20 Blackboard Expired CA157539A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA157539T 1914-04-20

Publications (1)

Publication Number Publication Date
CA157539A true CA157539A (en) 1914-08-25

Family

ID=45277245

Family Applications (1)

Application Number Title Priority Date Filing Date
CA000157539A Expired CA157539A (en) 1914-04-20 1914-04-20 Blackboard

Country Status (1)

Country Link
CA (1) CA157539A (en)

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