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.)
Mitsubishi Chemical Corp
Japan National Railways
Nippon Kokuyu Tetsudo
Original Assignee
Japan National Railways
Mitsubishi Petrochemical Co Ltd
Nippon Kokuyu Tetsudo
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 Japan National Railways, Mitsubishi Petrochemical Co Ltd, Nippon Kokuyu TetsudofiledCriticalJapan National Railways
Priority to JP6134075ApriorityCriticalpatent/JPS51138027A/ja
Publication of JPS51138027ApublicationCriticalpatent/JPS51138027A/ja
Publication of JPS5340256B2publicationCriticalpatent/JPS5340256B2/ja