#control_grid__controlgrid__grid  an electrode placed between the cathode and anode of a vacuum tube to control the flow of electrons through the tube
  supertype:  electrode  a conductor used to make electrical contact with some part of a circuit
  part of:  thermionic_vacuum_tube__tube__vacuum_tube__thermionic_tube__electron_tube__thermionic_valve  electronic device consisting of a system of electrodes arranged in an evacuated glass or metal envelope
     part of:  electrical_circuit__circuit__electric_circuit  an electrical device that provides a path for electrical current to flow
        part of:  electronic_equipment  equipment that involves the controlled conduction of electrons (especially in a gas or vacuum or semiconductor)

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