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Text File  |  1999-10-21  |  177b  |  13 lines
  1. An ultrasonic transducer, amplifier and parabolic reflector 
  2.  
  3. A hand-held RF sniffer
  4.  
  5. An FM receiver with a directional antenna
  6.  
  7. An AM receiver with a directional antenna
  8.  
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  10.  
  11. 2
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