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ITU-T Q.421

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ITU-T Q.421

Digital line signalling code

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$12.50

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$25.00

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Author ITU
Editor ITU
Document type Standard
Format File
ICS 33.040.35 : Telephone networks
Number of pages 2
Year 1980
Document history
Country Switzerland
Keyword CCITT Q.421;ITU-T 421;421