CA785503A - Chalk screen image projector - Google Patents

Chalk screen image projector

Info

Publication number
CA785503A
CA785503A CA785503A CA785503DA CA785503A CA 785503 A CA785503 A CA 785503A CA 785503 A CA785503 A CA 785503A CA 785503D A CA785503D A CA 785503DA CA 785503 A CA785503 A CA 785503A
Authority
CA
Canada
Prior art keywords
chalk
screen image
image projector
projector
screen
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
CA785503A
Inventor
F. Peckman Eugene
W. Carlson Arthur
R. Torrey Frank
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.)
EH Sheldon and Co
Original Assignee
EH Sheldon and Co
Publication date
Application granted granted Critical
Publication of CA785503A publication Critical patent/CA785503A/en
Expired legal-status Critical Current

Links

CA785503A Chalk screen image projector Expired CA785503A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA785503T

Publications (1)

Publication Number Publication Date
CA785503A true CA785503A (en) 1968-05-21

Family

ID=36248168

Family Applications (1)

Application Number Title Priority Date Filing Date
CA785503A Expired CA785503A (en) Chalk screen image projector

Country Status (1)

Country Link
CA (1) CA785503A (en)

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