Education and demonstration – Mathematics – Arithmetic
Patent
1990-10-26
1991-12-24
Bahr, Robert
Education and demonstration
Mathematics
Arithmetic
434171, 434159, G09B 100
Patent
active
050747940
ABSTRACT:
A puzzle for teaching the sequence of a series of elements as number or letters. The elements, in their characteristic outline shapes, are fitted overlapping in sequence into correspondingly shaped pockets in a board. A following element, seated before the next preceding element, blocks the preceding element from being seated.
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Bahr Robert
Richard Karen A.
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