My Invention the Tank By deadmaniscoming Sep 16, 1487 comes up with tank idea http://leonardodavinci.stanford.edu/submissions/ghoe/leonardo.htm Period: Sep 16, 1487 to May 23, 2013 tank May 23, 1770 first tank designed http://www.elenco.com/admin_data/pdffiles/EDU61006.pdf May 23, 1899 rotating cannon was added http://www.elenco.com/admin_data/pdffiles/EDU61006.pdf May 23, 1915 a prototype was created in britain http://www.elenco.com/admin_data/pdffiles/EDU61006.pdf Period: May 23, 1990 to May 23, 1991 current tanks http://www.elenco.com/admin_data/pdffiles/EDU61006.pdf
