WebThe Felt and Tarrant Manufacturing Company was founded to manufacture the Comptometer, invented by Dorr Eugene Felt and patented in 1887. This machine was the first truly practical and commercially successful adding machine, with the first serious manufacture and sales occuring in 1888. We recognize our sponsors starting at $1 per … WebIntroduction. These pages give a detailed technical description of the internal mechanism of the Felt & Tarrant Model J Comptometer. The description can also be used (with suitable modifications) with any of the manually-operated "rock frame" Comptometers (Models H, J, M, WM, and 3D11) that were manufactured from 1920 to the 1960s.

The Felt & Tarrant Model J Comptometer - Technical Description …

WebFind many great new & used options and get the best deals for Antique Vintage Felt & Tarrant Comptometer Adding Machine at the best online prices at eBay! Free shipping for many products! WebFelt & Tarrant Comptometer. Catalog Number XB174.81. Type Physical object. Description Wooden comptometer. Metal device with two long rods going down … perk test for septic tank

Felt and Tarrant Manufacturing Company People The …

WebFelt: Comptometer: Adding machine-371496: Chauncey W. Foster and himself (Felt) March 12, 1887: October 11, 1887: Felt: Comptometer: Adding machine: Improvement to 366,945: ... Felt & Tarrant Manufacturing Co. March 8, 1889: November 25, 1890: Felt (no printing Comptometers) Type writing machine: Printing with hammers instead of direct … WebAntique Vintage Felt & Tarrant Comptometer Adding Machine. $70.00. Free shipping. Antique Comptometer Adding Machine Felt & Tarrant Mfg. Co. Chicago 12710. $50.99 + $18.70 shipping. Felt & Tarrant Mfg. Co. Comtometer Typewriter. $75.00. Free shipping. Picture Information. Picture 1 of 7. Click to enlarge. Hover to zoom. http://xnumber.com/xnumber/pic_comptometer.htm perk test results interpretation