Electronic calculator

Details Electronic calculator Electronic calculator

1977-11-07

1978-10-10

Smith, Jerry

Boots, shoes, and leggings

58 50R, 58152R, 364705, 364710, G06F 302, G06F 1502, G04B 1930

Patent

active

041200403

ABSTRACT:
An electronic calculator using a very small number of operative keys which comprises only four operative keys in all, that is, key for presetting a digit (0 to 9) of any order in a display section, the key for shifting the digit, the key for designating a specified mode from among a plurality of modes of calculating operation and the equal key for providing the result of calculating operation, wherein combination of these keys attains any desired type of function.

REFERENCES:
patent: 3553445 (1971-01-01), Hernandex
patent: 3764791 (1973-10-01), Kashio
patent: 3813533 (1974-05-01), Cone et al.
patent: 3816730 (1974-06-01), Yamamoto et al.
patent: 3852952 (1974-12-01), Vittoz et al.
patent: 3892958 (1975-07-01), Tung
patent: 3937939 (1976-02-01), Frenkel
patent: 3955355 (1976-05-01), Luce

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