Manual sliding calculator
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United States of America Patent
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-
Aug 2, 1994
Grant Date -
N/A
app pub date -
Jun 7, 1993
filing date -
Jun 7, 1993
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
An early age abacus type teaching device comprising a rod having movable counters thereon with corresponding sequentially spaced numerals therealong whereby the numerals are utilized to represent the calculation of the preceding manipulated counters and the rod is equipped at each end thereof with a device to support and hold the same upon a horizontally or vertically disposed surface.
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Family
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