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Priority claimed from JP17653588Aexternal-prioritypatent/JPH0226841A/en
Priority claimed from JP1148160Aexternal-prioritypatent/JP2762421B2/en
Priority claimed from JP14138789Aexternal-prioritypatent/JP2754042B2/en
Application filed by Toshiba Tungaloy Co LtdfiledCriticalToshiba Tungaloy Co Ltd
Priority claimed from EP89908503Aexternal-prioritypatent/EP0379597B1/en
Application grantedgrantedCritical
Publication of ATE105272T1publicationCriticalpatent/ATE105272T1/en