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Priority to JP1988054685UpriorityCriticalpatent/JPH0429260Y2/ja
Publication of JPH01157981UpublicationCriticalpatent/JPH01157981U/ja
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tubo de aço sem costura com superfìcie tratada, método de fabricação do tubo de aço e lìquido para tratamento por conversão quìmica para um tubo de aço.