Sumlock Comptometer calculators

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Date
1963-05
Credit Line
Courtesy of the Vintage Calculators Web Museum
Copyright Owner
© Sumlock Comptometer, Ltd.
Keywords
Advertising; Vacuum tube; Comptometer; Bell Punch/Sumlock; Mechanical calculation; Electronic calculation; ANITA
Object ID
500004265

The first commercial electronic calculator was developed by a British firm related to Dorr E. Felt, who patented the Comptometer in 1887.