Mechanical Calculators

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Imperial Office Master

Imperial Office Master

Imperial Office Master

Hand operated 10-key add-lister.

Prints totals up to 999,999,999.99

Addition and subtraction (multiplication and even division is possible using special techniques).

210 x 340 x 150 mm (8.25" x 13.5" x 5.9").

Introduced at the end of 1970.

Made in Germany by W. Feiler, G.m.b.h.
for Imperial Typewriter Company, Leicester, England.
This company was taken over by Litton Industries in the mid 1960s. It sold calculators in the early 1970s, many of which are similar to Royal Typewriter and Triumph/Adler models, companies also owned by Litton. Click here for further information on Imperial models.

Inside Imperial Office Master

With the cover removed.

This manual mechanical adding machine was introduced to the market as late as the end of 1970. It was still much cheaper than the electronic calculators of the time and if you only wanted add-listing it would perform the job quite adequately.

Vintage Calculators

© Text & photographs copyright Nigel Tout   2000-2017  except where noted otherwise.