Dorr Felt
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Dorr Eugene Felt was an American inventor and industrialist who was known for having invented the Comptometer, an early computing device, and the Comptograph, the first printing adding machine. The Fe
Dorr E Felt Portrait
Felt Summer Mansion
Felt's grave at Rosehill Cemetery
Comptometer
Videos
The comptometer was the first commercially successful key-driven mechanical calculator, patented in the United States by Dorr Felt in 1887.
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, an early computing device, and the Comptograph, the first printing adding machine. The Felt & Tarrant Manufacturing Company that he co-founded with…
Prototype of the first all-electronic desktop calculator marketed by Sumlock Comptometer Ltd of the UK
The macaroni box (1885)
Model A (1905)
Model J (1930s)