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
Proterial Ltd
Original Assignee
Hitachi Ltd
Hitachi Metals 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 Ltd, Hitachi Metals LtdfiledCriticalHitachi Ltd
Priority to JP11559477ApriorityCriticalpatent/JPS5449923A/en
Priority to US05/946,020prioritypatent/US4278581A/en
Priority to DE2842114Aprioritypatent/DE2842114C2/en
Publication of JPS5449923ApublicationCriticalpatent/JPS5449923A/en