Publication Date: 08/15/1989 Filing Date: 03/18/1987 Export Citation: Click for automatic bibliography generation Assignee: NGK Spark Plug Co., Ltd. (Nagoya, JP) Primary Class: 422/98 Other Classes: 73/23.32, 338/34, 422/94, 422/95, 422/96, 422/97, 427/343, 427/344, 436/152 ...