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 JP17653588Aexternal-prioritypatent/JPH0226841A/ja
Priority claimed from JP1148160Aexternal-prioritypatent/JP2762421B2/ja
Priority claimed from JP14138789Aexternal-prioritypatent/JP2754042B2/ja
Application filed by Toshiba Tungaloy Co LtdfiledCriticalToshiba Tungaloy Co Ltd
Priority claimed from PCT/JP1989/000709external-prioritypatent/WO1990000528A1/ja
Application grantedgrantedCritical
Publication of ATE105272T1publicationCriticalpatent/ATE105272T1/de