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SUMLOCK COMPTOMETER CALCULATOR MODEL 912/S , 1960's

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SUMLOCK COMPTOMETER CALCULATOR MODEL 912/S , 1960's

In 1960 the Bell Punch Company gained the right to the name Comptometer from the U.S. Comptometer Corporation.
This is Sterling currency Comptometer, with 10 decades, shillings, and pence. Note that the pence column does not have keys 1 to 11, only the standard number of decimal keys (1 to 9) so to enter 10d or 11d the operator has to successively press two keys to give the required figure.
The keyboard.
From left to right there are 9 columns of keys for Pounds, 2 columns of keys to give up to 20 shillings, and one column of keys to give up to 12 pence (there are only keys 1 to 9 so to enter 11 pence, for example, you have to press e.g. 5 and then 6). The name Comptometer has become synonymous with this type of calculator by whoever made them. In 1957 the Felt and Tarrant Manufacturing Company changed its name to Comptometer Corporation and in 1960 Comptometer Corporation sold its UK operation, including the right to the Comptometer name in Britain, to Control Systems Ltd, the parent of Bell Punch, which merged it with its own company to form Sumlock-Comptometer. Comptometer Corporation then contracted with Control Systems to have all its machines made by Bell Punch in England and shipped back to the U.S.A. This resulted in all Comptometer production ceasing in Chicago in 1961, and in machines from Sumlock being marked with the Comptometer name. Although these machines were very successful and thousands were sold, only a few companies manufactured the "Comptometer" type of calculator. The main manufacturers were Felt & Tarrant (later Victor Comptometer) and Burroughs in the U.S.A., and Bell Punch in Britain.

Your comments:

  • Sumlock was later owned by Rockwell (of America) who sold out their UK interest 1975, which I believe became Sumlock International Ltd. Early till roll electric 'calculators' from Hewlett Packard were then sold supplanting the mechanical comptometers.
    .......... J Spreckley, Croydon. Surrey., 20th of June 2014

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