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 JP2138232Aexternal-prioritypatent/JP2507670B2/en
Application filed by Hitachi LtdfiledCriticalHitachi Ltd
Priority to SG19894ApriorityCriticalpatent/SG19894G/en
Publication of SG19894GpublicationCriticalpatent/SG19894G/en