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2. Calculator input methods - Wikipedia

   en.wikipedia.org/wiki/Calculator_input_methods

   Calculator input methods. There are various ways in which calculators interpret keystrokes. These can be categorized into two main types: On a single-step or immediate-execution calculator, the user presses a key for each operation, calculating all the intermediate results, before the final value is shown. [1] [2] [3]

3. Mechanical calculator - Wikipedia

   en.wikipedia.org/wiki/Mechanical_calculator

   This picture shows clockwise from top left: An Arithmometer, a Comptometer, a Dalton adding machine, a Sundstrand, and an Odhner Arithmometer. A mechanical calculator, or calculating machine, is a mechanical device used to perform the basic operations of arithmetic automatically, or (historically) a simulation such as an analog computer or a ...

4. HP calculators - Wikipedia

   en.wikipedia.org/wiki/HP_calculators

   Smaller programmable model with programs up to 49 steps. Version HP-25C was first calculator with "continuous memory". HP-27S: 1988 The first HP pocket calculator to use algebraic notation only rather than RPN. It was a "do all" calculator that included algebraic solver like the HP-18C, statistical, probability and time/value of money ...

5. Reverse Polish notation - Wikipedia

   en.wikipedia.org/wiki/Reverse_Polish_notation

   By this time, HP was the leading manufacturer of calculators for professionals, including engineers and accountants. Later calculators with LCDs in the early 1980s, such as the HP-10C , HP-11C , HP-15C , HP-16C , and the financial HP-12C calculator also used reverse Polish notation.

6. Pregnancy Due Date Calculator - WebMD

   www.webmd.com/baby/healthtool-due-date-calculator

   Enter Your Due Date: View my calendar. Don't know your due date? Use our Due Date Calculator to find out. Enter the first day of your last period to find out when your baby will arrive.

7. Curta - Wikipedia

   en.wikipedia.org/wiki/Curta

   Curta Type II mechanical calculator Curta Type I, on display at the Musée des Arts et Métiers, Paris. A partially disassembled Curta calculator, showing the digit slides and the stepped drum behind them Curta Type I calculator, top view Curta Type I calculator, bottom view. The Curta is a hand-held mechanical calculator designed by Curt ...