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 JP56195687Aexternal-prioritypatent/JPS5897992A/ja
Priority claimed from JP57022703Aexternal-prioritypatent/JPS58141090A/ja
Priority claimed from JP57081402Aexternal-prioritypatent/JPS58198981A/ja
Priority claimed from JP57150763Aexternal-prioritypatent/JPS5941992A/ja
Application filed by Hitachi LtdfiledCriticalHitachi Ltd
Priority claimed from EP82111130Aexternal-prioritypatent/EP0081198B1/de
Application grantedgrantedCritical
Publication of ATE27757T1publicationCriticalpatent/ATE27757T1/de