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3、 KS D 3752 SM15CK . 7 7.1 KS B 0811 . 7.2 . 7.3 . KS K 9309:2008 3 a) D , , . b) d . c) . 8 3.4. . . 9 . 135513 7017 (02)60094114 (02)600948878 http:/ KS K 9309:2008 KSKSKS SKSKS KSKS SKS KS SKS KSKS SKSKS KSKSKS Double ring for ear-shaped traveller ICS 59.120.30 Korean Agency for Technology and Standards http:/www.kats.go.kr