#mechanical_drawing  scale drawing of a machine or architectural plan etc,
  supertype:  #drawing  picture produced by representing forms or objects on a surface by means of lines; "he did complicated pen-and-ink drawings like medieval miniatures"
  subtype:  #horizontal_section  a mechanical drawing of an object as if made by a plane cutting through it horizontally
  subtype:  #vertical_section  a mechanical drawing showing the interior of an object as if made by a vertical plane passing through it

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