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Q.400-Q.490�:�Specifications of Signalling System R2 �

Recommendation Q.400-Q.490

In force components
Number
 Title Status
Q.400-Q.490 (11/88)
� 		Specifications of Signalling System R2 �
Initially published in Blue Book Fascicle VI.4 (1988). Available now in electronic format only 		In force

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