Inventor: Machida, Yutaka, Kotobuki, Kazuo
Inventor: Kotobuki, Kazuo, Sanada, Tetsuro
Inventor: Kotobuki, Kazuo, Masuda, Tetsuo
Inventor: Kotobuki, Kazuo, Sato, Yoshihiko
Inventor: Nishida, Teruo, Fujita, Haruhiko
Inventor: Kanato, Kitsuo, Machida, Yutaka
Inventor: Machida, Yutaka, Kotobuki, Kazuo
Inventor: Kanato, Kitsuo, Machida, Yutaka