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 JP28704988Aexternal-prioritypatent/JP2633932B2/en
Priority claimed from JP31564988Aexternal-prioritypatent/JP2633937B2/en
Application filed by Toto LtdfiledCriticalToto Ltd
Priority claimed from EP89121013Aexternal-prioritypatent/EP0369377B1/en
Application grantedgrantedCritical
Publication of ATE87343T1publicationCriticalpatent/ATE87343T1/en