CA70155A - Blackboard ruler - Google Patents

Blackboard ruler

Info

Publication number
CA70155A
CA70155A CA000070155A CA70155DA CA70155A CA 70155 A CA70155 A CA 70155A CA 000070155 A CA000070155 A CA 000070155A CA 70155D A CA70155D A CA 70155DA CA 70155 A CA70155 A CA 70155A
Authority
CA
Canada
Prior art keywords
blackboard
ruler
blackboard ruler
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
CA000070155A
Other languages
French (fr)
Inventor
William Hugh Fletcher
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 CA70155A publication Critical patent/CA70155A/en
Expired legal-status Critical Current

Links

CA000070155A 1900-06-01 1900-06-01 Blackboard ruler Expired CA70155A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA70155T 1900-06-01

Publications (1)

Publication Number Publication Date
CA70155A true CA70155A (en) 1901-02-05

Family

ID=45186692

Family Applications (1)

Application Number Title Priority Date Filing Date
CA000070155A Expired CA70155A (en) 1900-06-01 1900-06-01 Blackboard ruler

Country Status (1)

Country Link
CA (1) CA70155A (en)

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