Antigravity craft slips past patent officers

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PDF) A Theory of the Podkletnov Effect based on General Relativity

PDF) · PDF fileShinichi Seike: The Principles of Ultra

Artificial Gravity

Technol Rep Tohoku Univ: GENERATION OF ANTI-GRAVITY

Secrets of Antigravity Propulsion: Tesla, UFOs, and Classified

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United States Patent and Trademark Office - Wikipedia

Patent Library of Fun, Interesting, Weird, Crazy, Ridiculous