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Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Inventor:
Katsuren; Roy I.
Address:
Centerville, OH
No. of patents:
1
Patents:












Patent Number Title Of Patent Date Issued
5568924 Supplemental card indicia idendifies like cards October 29, 1996
The purpose of this invention is to provide a means by which complementary expressions, viz., questions and answers, pictures and words, words and symbols, pictures and pictures, words and words, symbols and symbols, etc., can be placed on different cards to enhance the learning of i










 
 
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