Calculator with equation display device

Details Calculator with equation display device Calculator with equation display device

1980-12-09

1983-05-31

Malzahn, David H.

Boots, shoes, and leggings

364709, G06F 738

Patent

active

043864120

ABSTRACT:
A calculator in which when numerical information and function information are sequentially input using ten keys and function keys of a key input section for obtaining a calculation result according to a calculation formula, the input information is stored in a memory. The operation is then performed and, simultaneously, a character formula universally representing the calculation formula with the input numerals replaced with characters is prepared. This character formula is displayed by the display section so that the input condition may be easily confirmed and input errors may be prevented with certainty.

REFERENCES:
patent: 3839630 (1974-10-01), Olander, Jr. et al.
patent: 3971924 (1976-07-01), Ozawa et al.
patent: 3971925 (1976-07-01), Wenninger et al.
patent: 3990053 (1976-11-01), Evans
patent: 4016411 (1977-04-01), Genin

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