Dual refill-type writing utensil

Assignee

• Kotobuki & Co.

Inventors

• Masuo Kubota (3 patents)
• Hidehei Kageyama (103 patents)
• Saburo Kobayashi (10 patents)
• Yoshihide Mitsuya (55 patents)
• Tadayoshi Ebinuma (11 patents)

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