Patents Assigned to Kabushiki Kaisha Zen-On Gakufu Shuppansha
  • Ocarina
    Patent number: D306454
    Type: Grant
    Filed: September 9, 1987
    Date of Patent: March 6, 1990
    Assignee: Kabushiki Kaisha Zen-On Gakufu Shuppansha
    Inventor: Ryo Kanamori
  • Castanet
    Patent number: D312092
    Type: Grant
    Filed: February 16, 1988
    Date of Patent: November 13, 1990
    Assignee: Kabushiki Kaisha Zen-On Gakufu Shuppansha
    Inventor: Ryo Kanamori
  • Musical tuning meter
    Patent number: D319250
    Type: Grant
    Filed: February 1, 1989
    Date of Patent: August 20, 1991
    Assignee: Kabushiki Kaisha Zen-On Gakufu Shuppansha
    Inventor: Kanji Iinuma
  • Castanet
    Patent number: D329657
    Type: Grant
    Filed: June 25, 1990
    Date of Patent: September 22, 1992
    Assignee: Kabushiki Kaisha Zen-on Gakufu Shuppansha
    Inventor: Keiji Nakamura