U.S. federal trademark · Serial No. 73153044 · Reg. No. 1103130
TOY CONSISTING OF TWO BALLS OF PLASTIC CONNECTED BY A LENGTH OF CORD OR SIMAIAL CONNECTOR, INTENDED TO BE OPERATED IN A RHUTHMIC MANNER BY AN UPWARD AND DOWNWARD MOTION OF THE HAND SO THAT BALLS WILL MEET FORCEFULLY AT THE TOP AND BOTTOM OF TWO SEMICIRCLES THUS CAUSING A "CLACKING" SOUND
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