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Die große Enzyklopädie des mechanischen Rechnens

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Patents  Great Britain  1992

 
  • Patent:GB2220770 09.09.1992 John Christopher Hirst : V.M.G. (velocity made good) comparator
  • Patent:GB2254953 21.10.1992 Mckenna, Josephine (P) und McKenna, James (P) : Musical Transposition Slide Rule

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