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Q.140-Q.180�:�Specifications of Signalling System No. 5 �

Recommendation Q.140-Q.180

In force components
Number
 Title Status
Q.140-Q.180 (11/88)
� 		Specifications of Signalling System No. 5 �
Initially published in Blue Book Fascicle VI.2 (1988). Available now in electronic format only. This set includes the amendments introduced on 12 March 1993 on Q.141 and Q.144 		In force

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