|American - circa 1913|
American Can Company of Chicago, Illinois machines are distinguished by
the setting mechanism, which requires the operator to position stepped
finger supports. The accuracy of the entry may be checked before pulling
the crank to commit the value to the register. The results are then
displayed on dials above the 'keyboard'. By 1914, this machine had been
introduced into 'all the most important European countries'."
University Computer History Museum - Mechanical Computing