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NF P01-011 (05/1945) (R2001)
CII FR-FHC-02a
3A E-1500
ITU-T G Supplement 5
CII SD-17
ANSI B153.1
ITU-T G Supplement 26
ITU-T J.68
NF P37-408 (09/1947) (R2007)
CII SD-26
NF C42-151 (06/1949) (R2014)
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