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https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjtDrTCZ3fkFEManKFNgCGxl6UYB1KgcNPSoRiLW1hzy7zp7x923Q3nUj3pBVWj6qXwQUKBF9wthFLXilcuZZb7BX5yFHCgk4jhcwuoAM_xGjt5IPPUPQffU92Tu0KUqYWD7VuQgX9DUijQ/s1600/JethroTullsSeedDrill.jpg

http://www.saburchill.com/history/chapters/IR/004f.html

http://en.wikipedia.org/wiki/Jethro_Tull_(agriculturist)

http://www.intellectualvillage.com/inventors/jethro-tull-the-inventor/

http://inventors.about.com/library/inventors/bljethrotull.htm

1 comment:

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