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  2. Calculator input methods - Wikipedia

    en.wikipedia.org/wiki/Calculator_input_methods

    Ten key input mode is available in printing calculators from companies such as Sharp, [20] and in software calculators like Judy's TenKey [21] used by accounting firms. Online tenkey training and certification tools are available as well, [ 22 ] [ 23 ] and some businesses use ten key typing speed as an employment criterion.

  3. Divisumma 18 - Wikipedia

    en.wikipedia.org/wiki/Divisumma_18

    The Divisumma 18 was an electronic printing business calculator manufactured by Olivetti in 1972 and designed by Milanese architect Mario Bellini. [ 1 ] [ 2 ] It was selected for its collection by the Museum of Modern Art in New York.

  4. Calculator spelling - Wikipedia

    en.wikipedia.org/wiki/Calculator_spelling

    Calculator spelling is an unintended characteristic of the seven-segment display traditionally used by calculators, in which, when read upside-down, the digits resemble letters of the Latin alphabet. Each digit may be mapped to one or more letters, creating a limited but functional subset of the alphabet, sometimes referred to as beghilos (or ...

  5. HP-19C/-29C - Wikipedia

    en.wikipedia.org/wiki/HP-19C/-29C

    HP-19C calculator HP-29C with AC-powered battery charger. The HP-19C and HP-29C were scientific/engineering pocket calculators made by Hewlett-Packard between 1977 and 1979. They were the most advanced and last models of the "20" family (compare HP-25) and included Continuous Memory (battery-backed CMOS memory) as a standard feature.

  6. HP-35 - Wikipedia

    en.wikipedia.org/wiki/HP-35

    Was the first scientific calculator to fly in space in 1973. [5] HP-35 calculators were carried on the Skylab 3 and Skylab 4 flights, between July 1973 and February 1974. [6] Is the first pocket calculator with a numeric range that covered 200 decades (more precise 199, ±10 ±99). [5]

  7. TI-30 - Wikipedia

    en.wikipedia.org/wiki/TI-30

    The original TI-30. The TI-30 is a scientific calculator manufactured by Texas Instruments, the first model of which was introduced in 1976.While the original TI-30 was discontinued in 1983 after several design revisions, TI maintains the TI-30 designation as a branding for its low and mid-range scientific calculators.

  8. Comparison of HP graphing calculators - Wikipedia

    en.wikipedia.org/wiki/Comparison_of_HP_graphing...

    A graphing calculator is a class of hand-held calculator that is capable of plotting graphs and solving complex functions. While there are several companies that manufacture models of graphing calculators, Hewlett-Packard is a major manufacturer. The following table compares general and technical information for Hewlett-Packard graphing ...

  9. Sharp EL-8 - Wikipedia

    en.wikipedia.org/wiki/Sharp_EL-8

    Although it was still too bulky to easily fit in a pocket, [1] it was an important step toward the development of the pocket calculator. [2] Ad showing the calculator's original price. The EL-8's original price in Japan was 84,800 Japanese yen. [3] The retail price in 1971 was US$ 345 (equivalent to US$ 2,308 in 2021). [1] [7]

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