when were mechanical clocks first invented

when were mechanical clocks first invented, first ever mechanical clock, why was the mechanical clock invented, who created the mechanical clock, the invention of the mechanical clock

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first ever mechanical clock

why was the mechanical clock invented

who created the mechanical clock

the invention of the mechanical clock

when were mechanical clocks first invented, first ever mechanical clock, why was the mechanical clock invented, who created the mechanical clock, the invention of the mechanical clock

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