#electric_hammer  a hammer driven by electric motor
  supertype:  #power_hammer__powerhammer__hammer  a power tool for drilling rocks
  part:  #electric_motor  a motor that converts electricity to mechanical work
     part:  #armature  coil in which voltage is induced by motion through a magnetic field
     part:  #brush.electrical_device  conducts current between rotating and stationary parts of a generator or motor
     part:  #field_magnet__fieldmagnet  a magnet that provides a magnetic field in a dynamo or electric motor
     part:  #rotor_coil__rotorcoil__rotor  the rotating armature of a motor or generator
     part:  #stator_coil__stator  mechanical device consisting of the stationary part of a motor or generator in or around which the rotor revolves

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