Manual teaching calculator

Details Manual teaching calculator Manual teaching calculator

1991-05-20

1992-09-22

Wilson, John J.

Education and demonstration

Mathematics

Arithmetic

434207, G06C 100

Patent

active

051492695

ABSTRACT:
An arithmetic teaching device consisting of a rod having hand movable spaced collars slidable thereon and having sequentially spaced numbers therealong corresponding to the collars whereby the numbers indicate visually the arithmetic calculation of preceeding manipulated numbers.

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

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