CA889395A - Teaching device with invisible answer indicator - Google Patents

Teaching device with invisible answer indicator

Info

Publication number
CA889395A
CA889395A CA889395A CA889395DA CA889395A CA 889395 A CA889395 A CA 889395A CA 889395 A CA889395 A CA 889395A CA 889395D A CA889395D A CA 889395DA CA 889395 A CA889395 A CA 889395A
Authority
CA
Canada
Prior art keywords
invisible
teaching device
answer indicator
answer
indicator
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
CA889395A
Inventor
F. Skinner Burrhus
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.)
Hawkeye Acquisition Inc
Original Assignee
Meredith Corp
Publication date
Application granted granted Critical
Publication of CA889395A publication Critical patent/CA889395A/en
Expired legal-status Critical Current

Links

CA889395A Teaching device with invisible answer indicator Expired CA889395A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA889395T

Publications (1)

Publication Number Publication Date
CA889395A true CA889395A (en) 1971-12-28

Family

ID=36395580

Family Applications (1)

Application Number Title Priority Date Filing Date
CA889395A Expired CA889395A (en) Teaching device with invisible answer indicator

Country Status (1)

Country Link
CA (1) CA889395A (en)

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