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US1982665.pdf (file size: 664 KB, MIME type: application/pdf)

Patent No. 1,982,665. “Explosion Turbine"; granted to Hans Holzwarth, of Dusseldorf, Germany.

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current22:43, 1 April 2020 (664 KB)RobertG (Talk | contribs) (Patent No. 1,982,665. “Explosion Turbine"; granted to Hans Holzwarth, of Dusseldorf, Germany.)

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