The Chinese made many useful inventions. Some, if not most, are still in use in the world today, or some part of them is used in a piece of equipment, e.g. the rotor on the helicopter.
One of the Chinese inventions was, indirectly, the helicopter rotor and propeller. Originally, in ancient China, a contraption called a helicopter top was originally used as a toy. It was invented in the fourth century AD. While the helicopter top remained a toy in China, it was to be used for a more important purpose. This was the helicopter rotors and propellers. The Western cultures used it for lifti
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