Joseph Enterprises - Bio, News, Photos - Washington Times
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==History==The Clapper, whose slogan is "Clap On! Clap Off!", was first sold to the public on September 1, 1985. A trademark was filed on the brand name "Clapper" with the U.S. Patent and Trademark Office on July 9, 1986 The apparatus was used for activating switches in response to different acoustic signals. - Source: Wikipedia

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