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ITU-T M.722
ANSI B152.2
ISO/IEC 30191 AMD 1 (2019-05)
NF L48-130 (04/1948) (R2008)
DIN 14463-2 Corrigendum 1
NF B51-001 (08/1941)
ISO/IEC 13818-1 (2019-05)
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