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Brevetti  Francia  1987

 
  • Patent:FR2585149 23.01.1987 Szlachetka Regis : Circular Slide Rule (information technology use)
  • Patent:FR2586121 13.02.1987 François Delmas Hugues Chorivit Edinter SA : Règle de lecture, de mesure et de calcul pour lanalyse dun électrocardiogramme
  • Patent:FR2586837 06.03.1987 Darne Andre : Novel type of Slide Rule of the type comprising a case consisting of two adjoining walls leaving a gap in which at least one slide moves
  • Patent:FR2592711 10.07.1987 Figard Pierre Freix Sarl Ets : Slide Rule with double reading

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