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Patente aus den USA 1997

  • Patent:US5597969 28.01.1997 Braeuer Karl Mayr Leslie : Music Slide Rule reference device and system
  • Patent:US5644096 01.07.1997 Bull, Gerard Neil : Musical Computational Devices
  • Patent:US5674075 07.10.1997 Sherman, Betty E. (P.O. Box 196, Buford, GA 30518) : Math teaching unit
  • Patent:US5691523 25.11.1997 Calvo, Frank A. (Wellington, FL) : Machinery shaft alignment calculator

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