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2. Stepped reckoner - Wikipedia

   en.wikipedia.org/wiki/Stepped_reckoner

   The stepped reckoner or Leibniz calculator was a mechanical calculator invented by the German mathematician Gottfried Wilhelm Leibniz (started in 1673, when he presented a wooden model to the Royal Society of London [2] and completed in 1694). [1]

3. Slide rule - Wikipedia

   en.wikipedia.org/wiki/Slide_rule

   The stress calculations for each transverse frame required computations by a pair of calculators (people) using Fuller's cylindrical slide rules for two or three months. The simultaneous equation contained up to seven unknown quantities, took about a week to solve, and had to be repeated with a different selection of slack wires if the guess on ...

4. Casio fx-7000G - Wikipedia

   en.wikipedia.org/wiki/Casio_fx-7000G

   Like many Casio calculators, the FX-7000G includes a programming mode, [3] in addition to its display and graphing mode. It holds 422 bytes of programming memory, [6] less than half a kilobyte. However the calculator does allow for expanded/additional memory by a method of reducing the number of steps within a program.

5. Software calculator - Wikipedia

   en.wikipedia.org/wiki/Software_calculator

   Calculators can also take in arbitrary information ranging from lifestyle information to scientific notation. Some examples of these types of software calculators include: Love calculator: The input is two names, and there is a button to work out the compatibility, as a percentage, of two people with these names.

6. Scientific calculator - Wikipedia

   en.wikipedia.org/wiki/Scientific_calculator

   TI's long-running TI-30 series being one of the most widely used scientific calculators in classrooms. Casio, Canon, and Sharp, produced their graphing calculators, with Casio's FX series (beginning with the Casio FX-1 in 1972 [9]). Casio was the first company to produce a Graphing calculator (Casio fx-7000G).

7. Calculator input methods - Wikipedia

   en.wikipedia.org/wiki/Calculator_input_methods

   Sharp calls this WriteView [27] on its scientific calculators and simply Equation Editor on its graphing calculators. [28] HP calls this its Textbook display setting, [29] which can be used in both RPN and Algebraic mode and in both the Stack and in the Equation Writer application. [30] Mathematica calls this Semantic-Faithful Typesetting. [31]