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US976732.pdf (file size: 173 KB, MIME type: application/pdf)

Patent No. 976,732. “Gyroscopic Rocket"; granted to Nicolas Gherassimoff, of St. Petersburg, Russia.

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current22:43, 1 April 2020 (173 KB)RobertG (Talk | contribs) (Patent No. 976,732. “Gyroscopic Rocket"; granted to Nicolas Gherassimoff, of St. Petersburg, Russia.)

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