invention
			 
			 
			
		
		
		
			
			Archaeological evidence indicates that the crossbow in China remained an individual weapon for centuries.  Numerous bronze trigger assemblies have been unearthed from the Zhou through Han Dynasties; these were mass-produced in government factories, and the component parts on many types are interchangeable.   The crossbow's evolution into an artillery piece took time, and by the Song Dynasty (AD 960-1279) some very large stationary ones, often utilizing several composite-recurved bows hitched up in tandem, were in common use.    Crossbow artillery, along with trebuchets, became obsolete early in the Ming (1368-1644) Dynasty with the gradual improvement of cannon, just as had occurred in Europe.   Individually-fired, portable weapons also fell from favor after the 16th cent., when matchlock muskets were introduced via the Portuguese and intermediaries with contacts in the Near East.
		 
		
		
		
		
		
		
		
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