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US1362997.pdf (file size: 369 KB, MIME type: application/pdf)

Patent No. 1,362,997. "Propelling Apparatus"; granted to Boris Koleroff, of New York, N. Y.

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current22:43, 1 April 2020 (369 KB)RobertG (Talk | contribs) (Patent No. 1,362,997. "Propelling Apparatus"; granted to Boris Koleroff, of New York, N. Y.)

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