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Comptometer

Known as: Comptometer Corporation, Sumlock Comptometer Ltd, Comptograph 
The comptometer was the first commercially successful key-driven mechanical calculator, patented in the USA by Dorr E. Felt in 1887. A key-driven… 
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Adding machineArithmometerComputerDifference engine

Papers overview

Semantic Scholar uses AI to extract papers important to this topic.
2010
2010
PRINTERS , RESEARCHERS , RADIO TRAINEES EXCELLENT OPPORTUNITIES FOR MEN , WOMEN N Y C Planning to Fill 1 2 7 Posts Without Exams
Accompanist, Assistant Architect, Assistant Civil Engineer, Assistant Director of Stores, Assistan t Gardener, Assistant in… 
2005
2005
Paper money comptometer
The subject innovation relates to that, more specifically, the bill counter technique to separate them by denomination, and… 
2005
2005
Comptometer and high speed scanner for Paper money
The subject innovation is particularly banknotes and checks, gift certificate, securities, Jiro classifies the scanned image in… 
2004
2004
Biography - Frank Lautenberg
Frank Lautenberg Frank Lautenberg’s background was different from the technical experience as a programmer or data processing… 
1997
1997
Ten's Complement Arithmetic
Brian Borchers Many mechanical adding machines, such as the Felt and Tarrant Comptometer and the Hoffritz Adder shown in Figure 1… 
1995
1995
Calculators
1990
1990
A computer perspective: background to the computer age (new ed.)
Introduction Prologue Charles Babbage Calculating Machines Statistical Machines Logical Automata 1890s The 1890 Census. First… 
1990
1990
American Scientists and Calculating Machines - From Novelty to Commonplace
Over the period 1865-1920, individual fascination with new commercial computing devices transformed the reduction of scientific… 
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