CA66425A - Blackboard - Google Patents

Blackboard

Info

Publication number
CA66425A
CA66425A CA000066425A CA66425DA CA66425A CA 66425 A CA66425 A CA 66425A CA 000066425 A CA000066425 A CA 000066425A CA 66425D A CA66425D A CA 66425DA CA 66425 A CA66425 A CA 66425A
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
CA000066425A
Other languages
French (fr)
Inventor
William James Semebroth
William Henry Herrick
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 CA66425A publication Critical patent/CA66425A/en
Expired legal-status Critical Current

Links

CA000066425A 1899-12-29 1899-12-29 Blackboard Expired CA66425A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA66425T 1899-12-29

Publications (1)

Publication Number Publication Date
CA66425A true CA66425A (en) 1900-02-27

Family

ID=45182963

Family Applications (1)

Application Number Title Priority Date Filing Date
CA000066425A Expired CA66425A (en) 1899-12-29 1899-12-29 Blackboard

Country Status (1)

Country Link
CA (1) CA66425A (en)

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