Calculator

A calculator is a device for performing numerical calculations. The type is considered distinct from both a calculating machine and a computer in that the calculator is a special-purpose device that may not qualify as a Turing machine. Although modern calculators often incorporate a general purpose computer, the device as a whole is designed for ease of use to perform specific operations, rather than for flexibility.

Patents

• {{US patent|2668661}} – Complex computer – G. R. Stibitz (electromechanic device that would calculate, record, and print results)
• {{US patent|3819921}} – Miniature electronic calculator – J. S. Kilby (TI electromechanic device)