General purpose calculator having keys with more than one functi

Details General purpose calculator having keys with more than one functi General purpose calculator having keys with more than one functi

1974-10-10

1976-05-04

Malzahn, David H.

Registers

Transfer mechanism

Traveling pawl

235145R, G06F 302

Patent

active

039550745

ABSTRACT:
A battery-powered, hand-held calculator employs MOS/LSI calculator circuits to perform arithmetic and financial calculations. Data and commands are input to the calculator from a keyboard having a prefix key to double the functions of selected keys. A 15-digit, seven-segment light emitting diode (LED) display serves as the output for the calculator.

REFERENCES:
patent: 3381276 (1968-04-01), James
patent: 3597600 (1971-08-01), Herendeen et al.
patent: 3757097 (1973-09-01), Kuijsten
patent: 3781820 (1973-12-01), Cochran et al.
patent: 3797630 (1974-03-01), Zilkha

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