Spark plug insulator production method, insulator, molding die

Assignee

• Ngk Spark Plug Co.

Inventors

• Hirokazu Kurono (41 patents)
• Hironori Uegaki (26 patents)
• Toshitaka Honda (55 patents)
• Hiroyuki Hazama (21 patents)
• Kuniharu Tanaka (34 patents)
• Hiroyuki Kawaji (15 patents)

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