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March 12, 2008

Comments

Jean-Louis

Hi,

I don't know if you're interested, but, in
Canada, there's a 1874 patent for a boat propelled by somewhat similar Archimedean screws. See:

http://www.collectionscanada.gc.ca/archivianet/patents/001038-119.01-e.php?&patent_id_nbr=3749&page_sequence_nbr=1&interval=20&

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