History
Ancient Chinese military mass produced crossbow triggers
HERE’S THE INTERESTING PART
Standardized, interchangeable parts are usually viewed as an incredibly modern industrial concept. Yet, ancient Eastern armories were casting complex bronze triggers by the tens of thousands that perfectly slotted into any standard issue weapon. If a soldier's firing mechanism broke mid-battle, they didn't need a custom blacksmith; they just snapped in a fresh modular piece and kept shooting.
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