Visual display device
United States Patent 3414987
US Patent References:
/0516005.html
- - 0516005

/0635182.html
- - 0635182

Child's educational toy
- - 2474447

Visual instruction aids
- - 2867045

Educational apparatus
- - 3276151


Inventors:
Lindenauer, Geoffrey G.
Publication Date:
12/10/1968
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Primary Class:
434/429
Other Classes:
434/430
International Classes:
G09F11/02; G09F11/00




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