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Achieve the impossible with Presti Cup! Presti Cup was developed thanks to the work of William Zavis. My research has resulted in a product that completely revolutionizes routines for Chop Cup or Cups and Balls. The strong points: - You have nothing to hide, your hands do not hide any gimmick. - All your movements will be natural and yet you will h..

Celebrate over 200 years of the most famous and bizarre patent artwork through playing cards! One line-art illustration per card. New inventions are described in patent documents, which usually have a dry, written description and a number of black-and-white line-art drawings. Just about everyone involved with a patent is listed on the front cove..