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T.20 : Standardized test chart for facsimile transmissions

Recommendation T.20 (11/88)

Approved in 1988-11

Status : Withdrawn

T.20 and T.21 are superseded by ITU-T T.22, and the test charts 1, 2 and 3 they described are replaced by test charts 4 and 5 of T.22


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Updated : 2009/10/28