#extractor  an instrument for extracting tight-fitting components
  supertype:  #instrument  a device that requires skill for proper use
  subtype:  #forceps  an extractor consisting of a pair of pincers used in medical treatment (especially for the delivery of babies)
     subtype:  #lion-jaw_forceps  a type of forceps
     subtype:  #mouse-tooth_forceps__mousetoothforcep  a type of forceps

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