Legal status (The legal status 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 status listed.)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
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 JP6000976Aexternal-prioritypatent/JPS52143787A/ja
Priority claimed from JP594677Aexternal-prioritypatent/JPS5391684A/ja
Priority claimed from JP594577Aexternal-prioritypatent/JPS5391683A/ja
Priority claimed from JP594477Aexternal-prioritypatent/JPS5391682A/ja
Priority claimed from JP2480777Aexternal-prioritypatent/JPS53110489A/ja
Priority claimed from JP2480677Aexternal-prioritypatent/JPS53110488A/ja
Application filed by Hitachi LtdfiledCriticalHitachi Ltd
Application grantedgrantedCritical
Publication of CA1201191ApublicationCriticalpatent/CA1201191A/fr