Education and demonstration – Mathematics – Arithmetic
Patent
1993-11-17
1994-09-13
Apley, Richard J.
Education and demonstration
Mathematics
Arithmetic
434159, 434171, 434188, 434200, G09B 100
Patent
active
053463994
ABSTRACT:
An educational apparatus includes a housing having a front wall with laterally spaced arrays of sensing and positioning holes and sets of letter or number display members each including one or more positioning pins and one or a pair of differently spaced and located positioning pins projecting from the rear faces of the display members, the pins being slidably engageable with respective holes. A switch matrix is located behind each hole array and is connected to the input of a calculator or message enunciating network located in the housing and having an output connected to LCD's on the housing front wall and/or to a transducer speaker in the housing. Calculator function switch buttons are located on the front wall.
REFERENCES:
patent: 3958344 (1976-05-01), Lesiak
patent: 4936780 (1990-06-01), Cogliano
patent: 4968255 (1990-11-01), Lee et al.
Apley Richard J.
Miskin Howard C.
Richman Glenn E.
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