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Die große Enzyklopädie des mechanischen Rechnens

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Patents  Great Britain  1986

 
  • Patent:GB2167015 21.05.1986 Smith Colin George : Proportional rule device for defining an area on a plane surface
  • Patent:GB2167351 29.05.1986 Cheng Tien Fu, Chou Lung-Chiao : Ellipsograph Capable Of Drawing A Broken Line
  • Patent:GB2173913 22.10.1986 Roland Smith University of Dundee : Measuring device
  • Patent:GB2175543 03.12.1986 Swift Raymond Basil : Board aid to positive guided drawing and sketching in perspective

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