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SAE AGS 251-11:1938-05-30
ITU-T Q.415
ITU-T Z.109
NFPA (Fire) 850
NFPA (Fire) 1931
SAE AGS 576-4:1938-02-01
EIA TEP 150:1964
JIS R 2501:1981 (R2003)
ITU-T X.519
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