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Medieval Technology Pages
30 peices of Mediaval technology and invention including agricultural tools, spectacles and windmills.
http://scholar.chem.nyu.edu/tekpages/Technology.html
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Submarine History 1580-1869: timeline of submarine development
Submarine history illustrated from 1580 to 1869
http://www.submarine-history.com/NOVAone.htm
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Some Early Microscopes from the Optical Institute in Wetzlar
Carl Kellner founded what was named the Optical Institute in Wetzlar Germany in 1849. By1851 he employed twelve workmen and was producing his first microscopes.
http://users.bestweb.net/~wissner/kellner/kellner1.html
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