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.)
Nippon Tokushu Togyo KK
Niterra Co Ltd
Original Assignee
NGK Spark Plug Co Ltd
Nippon Tokushu Togyo KK
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 NGK Spark Plug Co Ltd, Nippon Tokushu Togyo KKfiledCriticalNGK Spark Plug Co Ltd
Priority to JP55184791ApriorityCriticalpatent/JPS57107003A/ja
Publication of JPS57107003ApublicationCriticalpatent/JPS57107003A/ja
Publication of JPS6243521B2publicationCriticalpatent/JPS6243521B2/ja