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  2. HP-35 - Wikipedia

    en.wikipedia.org/wiki/HP-35

    Introduced at US$395 (equivalent to $2,900 in 2023), [2] like HP's first scientific calculator, the desktop 9100A, it used reverse Polish notation (RPN) rather than what came to be called "algebraic" entry. The "35" in the calculator's name came from the number of keys. The original HP-35 was available from 1972 to 1975.

  3. HP-65 - Wikipedia

    en.wikipedia.org/wiki/HP-65

    The HP-65 is the first magnetic card-programmable handheld calculator. Introduced by Hewlett-Packard in 1974 at an MSRP of $795 [ 1 ] (equivalent to $4,912 in 2023) [ 2 ] , it featured nine storage registers and room for 100 keystroke instructions.

  4. HP 35s - Wikipedia

    en.wikipedia.org/wiki/HP_35s

    The case features many design elements from 1970s HP calculators such as the ground-breaking HP-65, including a black case with silver-striped curved sides, slope-fronted keys, and gold and blue shift keys. The faceplate is metal, bonded to the plastic case. The key legends are printed, rather than the double-shot moulding used in the vintage ...

  5. HP-55 - Wikipedia

    en.wikipedia.org/wiki/HP-55

    The HP-55 was a programmable handheld calculator, a lower-cost alternative to the HP-65. Introduced by Hewlett-Packard in 1975, it featured twenty storage registers and room for 49 keystroke instructions.

  6. HP calculators - Wikipedia

    en.wikipedia.org/wiki/HP_calculators

    The finance-centric programmable calculator from the Voyager series introduced in the 1980s. The longest running product in the HP calculator line, it remains in production. Various models exist, the latest in 2008. HP-14B: 1988 Finance calculator with 12 digits precision and algebraic logic. It has 130 functions, 41 keys, and an LCD display ...

  7. HP-45 - Wikipedia

    en.wikipedia.org/wiki/HP-45

    The HP-45 is the second scientific pocket calculator introduced by Hewlett-Packard, adding to the features of the HP-35.It was introduced in 1973 [1] with an MSRP of US$395 [2] (equivalent to $2,711 in 2023). [3]

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