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Die große Enzyklopädie des mechanischen Rechnens

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Patents  Great Britain  1980

 
  • Patent:GB1563423 26.03.1980 Sidney Alan Lippiatt Bendix Westinghouse Ltd. : Ratio indicating apparatus
  • Patent:GB1568948 11.06.1980 Kabushiki Kaisha Sunpak : Guide number dial
  • Patent:GB2035640 18.06.1980 Craig, G (P) : Instructional device of the slide rule type

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