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  H1: Power sources






  H2: Power sources, Water
      circuit






  H3: Oscilloscope, Frequency
      Generator, Light bulbs
      with outlet connection,
      Light bulb with +- wire
      connection, Variacs





  H4: Power supplies





  H5: Magnetic Wheel turn,
      Solenoid circuit parts, Ring
      race, Large galvenometer






  H6: Bike pedal power
      charger, Hand crank
      generators, Wind power
      demo, Solar cells,
      Kill-a-Watt meter