Combined electronic calculator and abacus with deflective guide bars
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United States of America Patent
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-
Jul 28, 1992
Grant Date -
N/A
app pub date -
May 23, 1989
filing date -
May 23, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An electronic calculator is provided with an abacus and has both advantages of the calculator and abacus. An abacus and a portable electronic calculator are integrally constituted in such a manner as superimposing each other. Thus, the calculator according to the present invention can be used as a abacus by shifting a counter of an abacus along a guide bar thereof and it can also be used as a conventional electronic calculator by pushing the counter downward.
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Cited Art Landscape
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