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| U.12 : Terminal and transit control signalling system for telex and similar services on international circuits (type D signalling) |
| In force components |
Number
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Title |
Status |
U.12 (03/93)
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Terminal and transit control signalling system for telex and similar services on international circuits (type D signalling)
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In force
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| Superseded and Withdrawn components |
Number
|
Title |
Status |
U.12 (11/88)
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Terminal and transit control signalling system for telex and similar services on international circuits (type D signalling)
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Superseded
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