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Sumlock ANITA calculator
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==Patents== * GB patent 868,753 β ''Improvements in or relating to Calculating Machines'' β Norbert Kitz, Robert Milburn, Christopher Webb: Bell Punch Company Ltd., 1961 (first application 6 September 1956, filed 6 September 1957), - Electronically controlled key operated office desk type calculating machine capable of addition, subtraction, multiplication, and division. * {{US patent|3280315}} - ''Key controlled decimal electronic calculating machine'' β Norbert Kitz: Bell Punch Company Ltd., 1966 (filed 29 December 1961), - Electromechanical and "space discharge type" electronic calculating machine capable of addition, subtraction, multiplication, and division.
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