Calculators Marketed by
Sumlock Bondain
Sumlock Bondain Ltd. was located on Cannon Street, London.
... Sumlock-Bondain, a company with its roots in the Sumlock-Anita calculator business. It was formed by people made redundant by the takeover of Sumlock-Anita by the U.S. giant Rockwell, who did
not want to see their talents go to waste and decided to continue in that same business.
Originally they sold the Sumlock calculator range but when that was wound up by Rockwell, they found favour with Texas
Instruments, for whom they are wholesalers, and with Hewlett-Packard, for whom they act as a main agent.[1]
Sumlock Bondain marketed several desktop calculators under its own name.
Known Sumlock Bondain models:
- Sumlock Bondain 122 PD - Programmable Printing Display financial calculator, with printer.
- Sumlock Bondain 320A - 12-digits display, 4-function, square root, memory.
- Sumlock Bondain 470 - 12-digits blue-green display & printer, 4-function, square root, memory, Japan.
Sumlock Bondain 320A
The display is 12 digits green VFD (Vacuum-Fluorescent Display).
The calculator is powered by AC.
Main integrated circuit is Hitachi HD38401A, here date-coded 1979.
Four-function, square root, memory.
196 mm x 274 mm x 72 mm (7.7" x 10.8" x 2.8").
Made in Japan.
With the cover removed showing the simplified electronics of a desktop calculator of the late 1970s. The VFD display is very prominent with the Hitachi HD38401A calculator integrated circuit below on the left.
Continuing Companies
Text & photographs copyright © 2002 - 2023 Nigel Tout, except where noted otherwise.