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BS 08/30129607 DC
M00000238
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BS 08/30129607 DC BS 8521. Specification for dual-tone multi-frequency (DTMF) signalling protocol for social alarm systems (21TC)
standard by BSI Group, 07/31/2008
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Cross References:
BS EN 50134
BS EN 50134
ES 201 235-1
ES 201 235-2
ES 201 235-4