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Sterling Currency Calculators
Smith-Corona Add-lister
L.C. Smith & Corona Typewriters Inc.
Note the nine "1" keys in the 10's of shillings column - 19 is the maximum number of shillings - and the extra "10" and "11" pence keys.
Photographed at the computing museum at Bletchley Park, see www.bletchleypark.org.uk.
Many typewriter manufacturers also produced mechanical calculators since they had similar methods of contruction using many small metal parts.
