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

Recommendation Q.120-Q.139

In force components
Number
Title Status
Q.120-Q.139 (11/88)
 
Specifications of signalling system No. 4  
Initially published in Blue Book Fascicle VI.2 (1988). Available now in electronic format only
In force

 

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Updated : 2014-09-17