Q.120-Q.139�:�Specifications of signalling system No. 4

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Q.120-Q.139�:�Specifications of signalling system No. 4 �

Recommendation Q.120-Q.139 (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

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