#drafting_instrument  an instrument used by a draftsman in making drawings
  supertype:  #instrument  a device that requires skill for proper use
  subtype:  #compass.drafting_instrument__compas  drafting instrument used for drawing circles
  subtype:  #dividers  a drafting instrument resembling a compass that is used for dividing lines into equal segments or for transferring measurements
  subtype:  #protractor  drafting instrument used to draw or measure angles
  subtype:  #triangle.drafting_instrument  any of various triangular drafting instruments used to draw straight lines at specified angles
  subtype:  #T-square  a square used by draftsmen to draw parallel lines

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