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Patent US5255452 - Method and means for creating anti-gravity illusion - Google Patents Cited Patent Filing date Publication date Applicant Title US1059284 * Mar 22, 1911 Apr 15, 1913 Edmond Dennis Ladder-gripping attachment for shoes. US2114790 * May 17, 1937 Apr 19, 1938 Robert C Hoffman Exercising device US2473099 * Jul 3, 1947 Jun 14 ...
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