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ISO 683-15:1976Withdrawn
Heat-treated steels, alloy steels and free-cutting steels — Part 15: Valve steels for internal combustion engines
Aciers pour traitement thermique, aciers alliés et aciers pour décolletage — Partie 15: Aciers pour soupapes de moteurs à combustion interne
This edition has been replaced by ISO 683-15:1992.