Education and demonstration – Mathematics – Arithmetic
Patent
1996-03-11
1997-08-05
Hirsch, Paul J.
Education and demonstration
Mathematics
Arithmetic
434172, 434207, G09B 116
Patent
active
056535945
ABSTRACT:
An educational toy which includes a base board having lines of female mounting portions longitudinally disposed at the first, third, fifth, and six lines and a line of signs of multiplication longitudinally disposed at the second line and a line of sings of equality at the fourth line, a set of setting blocks, each setting block having a male mounting portion at the bottom for fitting into engagement with one female mounting portion of the base board, and a set of number blocks, each number block having a female mounting portion at the bottom for fitting into engagement with one particular setting block, the number blocks including a blank number block having a blank top, and a set of numerical blocks respectively marked with one of the numerical signs from 0 to 9 at the top.
REFERENCES:
patent: 2513596 (1950-07-01), Severson et al.
patent: 4212117 (1980-07-01), Baldwin et al.
patent: 4419081 (1983-12-01), Steinmann
patent: 4422642 (1983-12-01), Fletcher
patent: 5120226 (1992-06-01), Tsai
patent: 5238407 (1993-08-01), Pollock
patent: 5338203 (1994-08-01), Rheams
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