Which adding machines for your office are best? While adding machines, sometimes referred to as printing calculators, may seem outdated and obsolete, they remain indispensable for offices all over the ...

This full-keyboard printing manual adding machine has a steel frame painted black, with the portion under the keyboard green. There are eight columns of color-coded ...

This small stylus-operated non-printing adding machine has seven chains in parallel columns. The links visible in each column are numbered from 1 to 9. A stylus is placed in a link of the chain and ...

An early adding machine, c. 1890, invented by William Seward Burroughs, grandfather of the beat writer. National Museum of American History Today every phone is a calculator, but in the late 1800s, ...