Cross References: EN 520 ISO 6308:1980 EN 12237 EN 1363-1 EN 1366-2 prEN 1366-5 EN 1366-8 EN 1507 prEN ISO 13943 ISO/DIS 13943:1998 EN 20898-1 EN ISO 5167-1 ISO 5167-1:1991 ISO 5221
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