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Polycon
The Polycons: the Sphericon (Or Tetracon) Has Found Its Family
United States Patent (11) 3,572,646 72 Inventor Heinz Kocher 390,533 8/1965 Switzerland
||||||||||||III USOO540.8598A United States Patent (19) 11 Patent Number: 5,408,598 Pryor, Jr
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