Victor Adding Machine Model 7 83 4 - Victor Comptometer, USA 1966.
A light-weight and very convenient adding machine for small businesses and office desktops because of a substantial noise reduction during the pull of the handle. An advantage was also the small keyboard, compared to the big ones of competitive machines. Above the keyboard a window that displays the number of inkeys from 1 to 8. The grey case is made of  hard plastic.

Barrett Printing Adder - Barrett Adding Machine Comp. Philadelphia 1910.
The Barrett machines were imported in Europe shortly after worldwar II.
Although robust, not expensive and very reliable the brand did never manage to conquer the European market. Afterwards other and cheaper models were introduced in Europe among which a printerless adder which had to compete with Comptometer, Burroughs, Astra and Sumlock.

Burroughs Adding Machine Company - St. Louis Missouri 1919.
Burroughs was an offspring of the American Arithmometer Company.
This very heavy machine prints input and adding results on a roll of paper. The lever at the left invokes printing, adding and resetting.

Burroughs Adding Machine - Burroughs Machine Co. Detroit 1911.
A key-set crank-operated adding machine that prints entries and totals on paper tapes or forms. The operator of a Burroughs entered the number on the keyboard and then pulled and released a lever on the side of the machine, causing the entry to print and to be added to the running total. Underneath the keyboard the mechanism can be seen through glass panels.

Remington Adder - Remington Typewriter Company 1948.
This well known manufacturer of typewriters, guns, the Univac computer and electric razors also made some (electro) mechanical calculators as an offspring of the typewriter production line. This elegant but heavy machine only performs the basic counting functions: add, repeat, subtotals and total.

Sundstrand Adder - Sundstrand Adding Machine Company, Pittsburg 1920.
A  ten key portable adding machine. The first models were put on the market in 1914.  Here a direct subtracting model. All models have the keyboard arranged in three rows of three keys each, with a bar or cipher key below; control keys are arranged along either side of the amount keys. A back space key allows the user to remove entry errors.

ASTRA Adding machine - Astra Werke. Based on Dalton Machines 1922.
Popular adding machine for the desktop with noisy printer mechanisme.
The machine operates with multi-zero keys (00, 000) for speeding up input.
This adder was rescued from the dust-bin and brought to me by a friend.

Resulta P7 Addiermachine - Maschinen- und Werkzeugfabrik Brüning 1951.
Small, compact but 'powerful' calculator with 4 basic calculating functions. Complete with a small printer which prints by pushing the lower bar very hard. The reset handle to the right clears the counters while the cumulative input is stored within the mechanism.

Burroughs Adding Machine Company - St. Louis Missouri 1959.
One of the last mechanical printing adders produced and shipped by Burroughs. New electro-mechanical and the first electronic calculators were about to take over with far more speed and functionality for less money.

TOTALIA Adder - Fabrica Addizionatrice Italiana SA-Milano 1961.
Totalia machines were made in Italy by FAI-Lagomarsino. A straight-forward mechnanical adder for adding and subtracting. Totals and subtotals are output on a paper roll. Same mechanical design as the AddoX. Smooth working, not too noisy mechanism.