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
Tokico 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, Tokico LtdfiledCriticalHitachi Ltd
Priority to JP3748376ApriorityCriticalpatent/JPS52120862A/ja
Priority to US05/783,019prioritypatent/US4111046A/en
Priority to FR7709748Aprioritypatent/FR2346721A1/fr
Priority to GB13830/77Aprioritypatent/GB1512198A/en
Publication of JPS52120862ApublicationCriticalpatent/JPS52120862A/ja
Publication of JPS577650B2publicationCriticalpatent/JPS577650B2/ja