chu state repeating crossbow (fire two bolts one time) before the chu-ko-nu
http://pic.zuojiaju.com/forum/201801/28/101029gmmm22mro7rfmma5.jpg
http://pic.zuojiaju.com/forum/201801/28/101035r51dr50qnjx0nau0.jpg
trigger mechanism
http://www.zuojiaju.com/thread-819168-1-1.html
Here is the bed crossbow(earlest compound crossbow with pulleys)
http://www.zuojiaju.com/thread-816423-1-1.html
bed crossbow
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