Manual sliding calculator

Details Manual sliding calculator Manual sliding calculator

1993-06-07

1994-08-02

Mancene, Gene

Education and demonstration

Mathematics

Arithmetic

434207, 434113, G06C 100

Patent

active

053340264

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.

REFERENCES:
patent: 465811 (1891-12-01), Anderson
patent: 541787 (1895-06-01), Hegewald et al.
patent: 1099009 (1914-06-01), Bennett
patent: 1718694 (1929-06-01), Kurowski
patent: 3076272 (1963-02-01), Schott
patent: 3092917 (1963-06-01), Podell
patent: 4812124 (1989-03-01), Colodner et al.

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