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 Insulators, Ltd.filedCriticalNgk Insulators, Ltd.
Publication of PL380874A1publicationCriticalpatent/PL380874A1/en
Publication of PL207256B1publicationCriticalpatent/PL207256B1/en