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

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

Recommendation Q.140-Q.180 (11/88)

Approved in 1988-11-25

Status : In force

�	Table of Contents
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

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