Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP1117681Aexternal-prioritypatent/JPH02298240A/ja
Priority claimed from JP1117680Aexternal-prioritypatent/JPH02298218A/ja
Priority claimed from JP1121244Aexternal-prioritypatent/JPH02301540A/ja
Application filed by Sumitomo Metal IndfiledCriticalSumitomo Metal Ind
Application grantedgrantedCritical
Publication of TW217425BpublicationCriticalpatent/TW217425B/zh