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.)
Dainippon Seito KK
Hitachi Ltd
Original Assignee
Dainippon Seito KK
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 Dainippon Seito KK, Hitachi LtdfiledCriticalDainippon Seito KK
Priority to JP4757075ApriorityCriticalpatent/JPS51123842A/ja
Publication of JPS51123842ApublicationCriticalpatent/JPS51123842A/ja
Publication of JPS5428456B2publicationCriticalpatent/JPS5428456B2/ja