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A Sharp scientific calculator using infix notation. Note the formula on the dot-matrix line above and the answer on the seven-segment line below, as w
A Sharp scientific calculator using infix notation. Note the formula on the dot-matrix line above and the answer on the seven-segment line below, as well as the arrow keys allowing the entry to be reviewed and edited.
The Hewlett-Packard Voyager series of calculators all use RPN input. The "Enter" key is used here to push the value on the display onto the stack.
The Hewlett-Packard Voyager series of calculators all use RPN input. The "Enter" key is used here to push the value on the display onto the stack.
This printing calculator made by Sharp uses ten-key notation. Notice the size and placement of the keys, including the extra-large "+/=" and the red "
This printing calculator made by Sharp uses ten-key notation. Notice the size and placement of the keys, including the extra-large "+/=" and the red "-/=" keys.
A Casio Natural Display scientific calculator displaying mixed fractions and their decimal equivalents in pretty-printing.
A Casio Natural Display scientific calculator displaying mixed fractions and their decimal equivalents in pretty-printing.
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Casio fx-991DE X - A modern Digital calculator from Casio with a dot matrix "Natural Textbook" LCD
Casio fx-991DE X - A modern Digital calculator from Casio with a dot matrix "Natural Textbook" LCD
Casio fx-77, a solar-powered digital calculator from the 1980s using a single-line LCD
Casio fx-77, a solar-powered digital calculator from the 1980s using a single-line LCD
HP-35, the world's first scientific pocket calculator, was introduced in 1972 by Hewlett-Packard. It used reverse Polish notation and an LED display.
HP-35, the world's first scientific pocket calculator, was introduced in 1972 by Hewlett-Packard. It used reverse Polish notation and an LED display.
TI SR-50
TI SR-50