Spark plug

Assignee

• Ngk Spark Plug Co.

Inventors

• Haruki Yoshida (83 patents)
• Kuniharu Tanaka (34 patents)
• Yutaka Yokoyama (85 patents)
• Shun Kondo (4 patents)
• Hirokazu Kurono (41 patents)
• Toshimasa Saji (6 patents)

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