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