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GE93692.pdf (file size: 570 KB, MIME type: application/pdf)
19th century reaction engine Patent Nr. 93,692, German, Beckmann, A., 1 Oct 1897
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current | 14:49, 10 June 2021 | (570 KB) | RobertG (Talk | contribs) | (19th century reaction engine Patent Nr. 93,692, German, Beckmann, A., 1 Oct 1897) |
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