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2. Scientific calculator - Wikipedia

   en.wikipedia.org/wiki/Scientific_calculator

   Casio fx-77, a solar-powered digital calculator from the 1980s using a single-line LCD. A scientific calculator is an electronic calculator, either desktop or handheld, designed to perform calculations using basic (addition, subtraction, multiplication, division) and advanced (trigonometric, hyperbolic, etc.) mathematical operations and functions.

3. Inverse Symbolic Calculator - Wikipedia

   en.wikipedia.org/wiki/Inverse_Symbolic_Calculator

   A user will input a number and the Calculator will use an algorithm to search for and calculate closed-form expressions or suitable functions that have roots near this number. Hence, the calculator is of great importance for those working in numerical areas of experimental mathematics. The ISC contains 54 million mathematical constants.

4. Comparison of Texas Instruments graphing calculators

   en.wikipedia.org/wiki/Comparison_of_Texas...

   The following table compares general and technical information for a selection of common and uncommon Texas Instruments graphing calculators. Many of the calculators in this list have region-specific models that are not individually listed here, such as the TI-84 Plus CE-T, a TI-84 Plus CE designed for non-French European markets.

5. Mechanical calculator - Wikipedia

   en.wikipedia.org/wiki/Mechanical_calculator

   Friden made a calculator that also provided square roots, basically by doing division, but with added mechanism that automatically incremented the number in the keyboard in a systematic fashion. The last of the mechanical calculators were likely to have short-cut multiplication, and some ten-key, serial-entry types had decimal-point keys.

6. Cyphernetics - Wikipedia

   en.wikipedia.org/wiki/Cyphernetics

   Cyphernetics Corporation was a commercial timesharing company founded in March 1969 and based in Ann Arbor, Michigan. [1] The company had a sales offices in most major American cities and many international locations, providing communications and technical support for clients.

7. Pascal's calculator - Wikipedia

   en.wikipedia.org/wiki/Pascal's_calculator

   Pascal's calculator (also known as the arithmetic machine or Pascaline) is a mechanical calculator invented by Blaise Pascal in 1642. Pascal was led to develop a calculator by the laborious arithmetical calculations required by his father's work as the supervisor of taxes in Rouen . [ 2 ]