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Conrad Kyeser's Bellifortis fig . en giant war tank invented by Alexander the Great from Conrad Kyeser's Bellifortis google id xkruNgC pg PA dq Bellifortis Kyeser sig ACfUUWxFOHaJsUxYKJmAGuxkXA PPA Conrad Kyeser ca public domain age PDold Ancient weapons Medieval weapons
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