GR - Ranging

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GR-1, ground listening set ( formerly geophone) 71-246
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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Equipment Group