Counterweight trebuchet 1726.jpg
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Counterweight trebuchet 1726, Images from Gujin Tushu Jicheng
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Counterweight trebuchet 1726, Counterweight trebuchet 1726, This is a vectorization of an illustration from the Chinese encyclopedia ''Gujin Tushu Jicheng'', section "Military Administration".
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対トレビュシェ1726, 欽定古今図書集成画像
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対等トレビュシェ1726,対等トレビュシェ1726, 中国の百科事典「欽定古今集成」の図解のベクトル化, 軍事行政
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counterweight counterbalance