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US2191841.pdf (file size: 185 KB, MIME type: application/pdf)

Patent No. 2,191,841. “Rocket"; granted to Rudolf Zwerina, of Vienna, Austria.

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current22:43, 1 April 2020 (185 KB)RobertG (Talk | contribs) (Patent No. 2,191,841. “Rocket"; granted to Rudolf Zwerina, of Vienna, Austria.)

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