Among the technological accomplishments of ancient China were paper (not papyrus) and papermaking, woodblock printing and movable type printing, the early lodestone and needle compass, gunpowder, toilet paper, early seismological detectors, matches, pound locks, the double-action piston pump, blast furnace and cast iron, the iron plough, the multi-tube seed drill, the suspension bridge, natural gas as fuel, the differential gear for the South Pointing Chariot, the hydraulic-powered armillary sphere, the hydraulic-powered trip hammer, the mechanical chain drive
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