GR - Ranging

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  • GR-1, ground listening set ( formerly geophone) 71-246. 1924
  • GR-2
  • GR-3 sound ranging
  • GR-4 Flash ranging
  • GR-5 hydroacoustic tracking set
  • GR-6 sound ranging
  • GR-7 hydroacoustic tracking set
  • GR-8 sound ranging
  • GR-9
  • GR-10
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