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Though the trick is reported to be of oriental origin, Frank Ducrot is the inventor of the common method using a clear disk. He devised it around the turn of the twentieth century. Al Baker improved the method with a rubber cover. Alexander Herrmann invented the double-walled " | Though the trick is reported to be of oriental origin, Frank Ducrot is the inventor of the common method using a clear disk. He devised it around the turn of the twentieth century. Al Baker improved the method with a rubber cover. Alexander Herrmann invented the double-walled " | ||
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