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Vintage Comptometer Mechanical Computer Felt & Tarrant Mfg. Co.
The original comptometer design was patented by Felt, on July 19, 1887 and on October 11, 1887.. Louanne first invented. Two years later, on June 11, 1889, he was granted a patent for the Comptograph. A Comptograph is a comptometer with a printing mechanism making it more like a key-set calculating … See more The Comptometer was the first commercially successful key-driven mechanical calculator, patented in the United States by Dorr Felt in 1887. A key-driven calculator is extremely fast because each key … See more Origins The comptometer is the direct descendant of the key-driven machine of Thomas Hill patented in the United States in 1857 and of the Pascaline invented by Blaise Pascal in France in 1642. By just replacing the input wheels of the … See more Wooden boxes The first machines were built using wooden boxes, which made them lighter but more fragile. They were called the "woodies", and … See more Felt & Tarrant Manufacturing Company Felt and Tarrant signed a partnership contract on November 28, 1887. The partnership was incorporated as the Felt & Tarrant … See more • Arithmometer • Difference engine • Genericized trademark See more • Media related to Comptometer at Wikimedia Commons • Comptometer "Biography of a Machine" – extensive history, model information, and Dorr Felt biography, archived … See more WebHome / Auctions / Primitive, Antiques & Collectibles Auction / Felt & Tarrant Comptometer and Electric Meter Parts. Prev Lot Back to Catalog Next Lot. Felt & Tarrant Comptometer and Electric Meter Parts. Lot Number:296. Connecting ... Start Time:4/10/2024 11:00:00 PM. End Time:4/13/2024 11:49:10 PM. fathers of nations play
Easy Instructions for operating the Controlled-Key Comptometer : Felt ...
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