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3、 a 8 . 5 , , , . 6 KS D 3753 S 2 S 3 KS D 3706 STS 440A, STS 440B, STS 440C , KS D 3503 , . 7 7.1 . a) , b) c) 7.2 4. , 5. 3.1 . 7.3 , . , . 7.4 KS D 8302 . 8 . ( ) 153787 1 145 3(16) (02)26240114 (02)26240148 http:/ KS P 5109: 2007KSKSKS SKSKS KSKS SKS KS SKS KSKS SKSKS KSKSKS Dental chisel ICS 11.060.20 Korean Agency for Technology and Standards http:/www.kats.go.kr