sanyou-sokki.ecat-db.com...NCRETE : NONDESTRUCTIVE METHODS] NUMBER OF HARDENED CONCRETE] 11....
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sanyou-sokki.ecat-db.com...NCRETE : NONDESTRUCTIVE METHODS] NUMBER OF HARDENED CONCRETE] 11. Hungarian Standard 4715/5-72 12. Belgium Standard NBN 748-21 8. Swedish BBK 79 9. Polish