1977-03-07
1978-10-24
Grieb, William H.
35 8A, 35 35C, G09B 706
Patent
active
041213556
ABSTRACT:
A learning device includes a learning sheet having for each question a set of answers, only one of which is the correct answer. The sheet is mounted on a base plate having a series of conducting bands which are tortuous or undulating so that the correct answers corresponding to the appropriate associated conducting bands will not be arranged in a straight line nor made obvious to the person using the learning device.
REFERENCES:
patent: 3057082 (1962-10-01), Wellington et al.
Itasaka Katsuhiko
Kimoto Chisaburo
Kimura Yoshinobu
Tanaka Ryu
Gakken Co. Ltd.
Grieb William H.
Weiner Irving M.
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