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Zeichengabesystem Nr.7
el. common channel signaling 7; common channel signalling 7
Zeichengabesystem Nr. 7
commun. Signalling System No 7
Zeichengabesystem-Nr.7
commun. signalling system No.7 (ITU-T (CCITT) Rec. Q.701-764, FTZ RL 1R7)

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