Sumlock Comptometer 993S Model 912/VZ/S/933.896.

 Home > Browse Our Collection > Calculators > Comptometers > Sumlock Comptometer 9 ... del 912/VZ/S/933.896.

A 10-decade, decimal Comptometer, electrically driven, with storage (memory).

Model number 912/VZ/S/933.896.
346 x 324 mm x 200 mm (13.5" x 12.75" x 8").

Made in Great Britain by Bell Punch Company Ltd.
Bell Punch acquired the right to use the name "Comptometer" from the U.S. Comptometer Corporation in 1960.

This machine has the standard full keyboard with 12 decades of keys (1 to 9). As usual on Comptometers, pressing a key adds that number to the accumulator register, as shown in the lower row of windows, here showing 12300000.

Pressing the + side of the rocker switch on the right adds the contents of the accumulator register to the storage register (memory) along the top, here showing 24600000. Pressing the "-" side of the rocker switch subtracts the accumulator contents from the storage register.

The clearing switch at lower right can individually clear the accumulator or the storage registers.

Our thanks to for the use of the cutaway pictures

Manufacturer: Sumlock
Date: 1st January 1964

Other Systems Related To Sumlock Comptometer 993S Model 912/VZ/S/933.896.:

Item Manufacturer Date
Sumlock Anita Comptometer Sumlock Unknown
Sumlock Comptometer LC/912/S/3251 Sumlock Unknown
Sumlock Comptometer 912/S Sumlock 1st January 1950
Sumlock Duolectric Comptometer Sumlock 1953
Sumlock Sumlomatic Comptometer 912/S/6a/604.052.A Sumlock 1959
Sumlock Comptometer 993S Model 912/VZ/S/918.174 Sumlock 1964
Sumlock Anita 1011B L.S.I. Electronic Calculator Sumlock 1971
Sumlock Anita 861 Electronic Calculator Sumlock 1974
Sumlock Compucorp 344 Statistician Sumlock 1979

This exhibit has a reference ID of CH1315. Please quote this reference ID in any communication with the Centre for Computing History.


Sumlock Comptometer 993S Model 912/VZ/S/933.896.

Click on the Image(s) For Detail

Help support the museum by buying from the museum shop

View all items

Founding Sponsors
redgate Google ARM Real VNC Microsoft Research
Heritage Lottery Funded
Heritage Lottery Fund
Accredited Museum