1991 | - Wood Land Jet Coaster, a steel roller coaster manufactured by Senyo Kogyo Co., opens at Hitachi Seaside Park in Hitachi, Ibaraki, Japan
- Ferris Wheel 'Blue Eyes', a Ferris Wheel ride manufactured by Senyo Kogyo Co., opens at Hitachi Seaside Park in Hitachi, Ibaraki, Japan
- Pirate Ship Regatta, a Regatta ride manufactured by Senyo Kogyo Co., opens at Hitachi Seaside Park in Hitachi, Ibaraki, Japan
- Super Swing, a Super Swing ride manufactured by Senyo Kogyo Co., opens at Hitachi Seaside Park in Hitachi, Ibaraki, Japan
- Hitachi Seaside Park opens in Hitachi, Ibaraki, Japan
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