Gyro's First Invention was published by a company founded in what city?
Egmont Group The Egmont Group (formerly The Gutenberghus Group) is a Danish media corporation founded and rooted in Copenhagen, Denmark. The business area of Egmont has traditionally been magazine publishing but has over the years evolved to comprise mass media generally.
Wham-O Wham-O Inc. is an American toy company headquartered in Carson, California, United States. They are known for creating and marketing many popular toys for nearly 70 years, including the Hula Hoop, the Frisbee, the Slip 'N Slide, the Super Ball, the Trac-Ball, Silly String, the Hacky Sack, and the Boogie Board.