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2. Comptometer - Wikipedia

   en.wikipedia.org/wiki/Comptometer

   It was the first printing-adding machine design to use individualized type impression which made its printed output very legible. The first comptograph was sold to the Merchants & Manufacturers National Bank of Pittsburgh, PA. in December 1889. It was the first sale of a recording-adding machine ever. This machine is now on display at the ...

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. Dorr Felt - Wikipedia

   en.wikipedia.org/wiki/Dorr_Felt

   Dorr Eugene Felt (March 18, 1862 – August 7, 1930) was an American inventor and industrialist who was known for having invented the Comptometer, [1] an early computing device, and the Comptograph, the first printing adding machine. The Felt & Tarrant Manufacturing Company that he co-founded with Robert Tarrant on January 25, 1889 [2] remained ...

5. Burroughs Corporation - Wikipedia

   en.wikipedia.org/wiki/Burroughs_Corporation

   Burroughs released the Class 3 and Class 4 adding machines which were built after the purchase of the Pike Adding Machine Company around 1910. These machines provided a significant improvement over the older models because operators could view the printing on the paper tape. The machines were called "the visible" for this improvement.

6. Monroe Systems for Business - Wikipedia

   en.wikipedia.org/wiki/Monroe_Systems_for_Business

   Products. electric calculators, printers, and office accessories. Monroe Systems for Business is a provider of electric calculators, printers, and office accessories such as paper shredders to business clients. [1] Originally known as the Monroe Calculating Machine Company, it was founded in 1912 by Jay Randolph Monroe as a maker of adding ...

7. Victor Technology - Wikipedia

   en.wikipedia.org/wiki/Victor_Technology

   Victor adding machine. Victor Adding Machine Co. was a fledgling company in 1918 when the operator of a chain of meat markets gave a Victor salesman $100, intending to buy an adding machine. Instead, he got 10 shares of the company's stock. In an effort to protect his investment, that man – Carl Buehler – became a director of Victor in ...