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
Application filed by Hitachi LtdfiledCriticalHitachi Ltd
Priority to JP3889780ApriorityCriticalpatent/JPS56135682A/ja
Priority to GB8109388Aprioritypatent/GB2072884B/en
Priority to CA000373902Aprioritypatent/CA1153087A/en
Priority to US06/248,537prioritypatent/US4386398A/en
Publication of JPS56135682ApublicationCriticalpatent/JPS56135682A/ja
Publication of JPH0224987B2publicationCriticalpatent/JPH0224987B2/ja