Mechanical pencil lead protection pipe with protuberance

Assignee

• Pentel Kabushiki Kaisha

Inventors

• Kamakura Kenichi (1 patents)
• Nobuo Murasawa (1 patents)
• Tsukasa Sasaki (8 patents)
• Yuichi Miyahara (10 patents)
• Hiroaki Okabayashi (1 patents)
• Tetsuya Sugiyama (42 patents)
• Masamitsu Nagahama (17 patents)
• Tsuruo Nakayama (17 patents)

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