Patents
- GB patent 868,753 – Improvements in or relating to Calculating Machines – Norbert Kitz, Robert Milburn, Christopher Webb: Bell Punch Company Ltd., 1961 (first application Sept. 6, 1956, filed Sept. 6, 1957), - Electronically controlled key operated office desk type calculating machine capable of addition, subtraction, multiplication, and division.
- U.S. Patent 3,280,315 - Key controlled decimal electronic calculating machine – Norbert Kitz: Bell Punch Company Ltd., 1966 (filed Dec. 29, 1961), - Electromechanical and "space discharge type" electronic calculating machine capable of addition, subtraction, multiplication, and division.
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