Combined counting board and abacus

Details Combined counting board and abacus Combined counting board and abacus

2000-01-13

2000-10-31

Veynar, Caron D.

Printing and office machinery

Typewriter or calculator

Calculator

1801

Patent

active

D04330552

REFERENCES:
patent: D181754 (1957-12-01), Schott
patent: 2228554 (1941-01-01), Brown
patent: 2872742 (1959-02-01), Schott
patent: 3076272 (1963-02-01), Schott
patent: 3455034 (1969-07-01), Schott
patent: 3633287 (1972-01-01), Squires et al.
patent: 3688418 (1972-09-01), Wilson
Popular Science; How to use an Abacus by W.D. Loy; pp. 86-90, Aug. 1948.

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