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ETSI ETS 300 392-12-21
M00000978
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ETSI ETS 300 392-12-21 Draft Edition 1Terrestrial Trunked Radio (TETRA); Voice plus Data (V+D); Part 12: Supplementary services stage 3; Sub-part 21: Ambience Listening (AL)
standard by European Telecommunications Standards Institute, 09/01/1996
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