using colour indicators

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  • Information Patent Application

    COLOR MEMORY TOY

    • Publication number 20030087580
    • Publication date May 8, 2003
    • YUTAKA SHIBAHASHI
    • A63 - SPORTS GAMES AMUSEMENTS
  • Information Patent Application

    Temperature sensitive color changing water toy

    • Publication number 20030077976
    • Publication date Apr 24, 2003
    • Veronica P.C. Wong
    • A63 - SPORTS GAMES AMUSEMENTS