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Pierre Le Roy

French clockmaker
Pierre Le Roy was a French clockmaker. He was the inventor of the detent escapement, the temperature-compensated balance and the isochronous balance spring. His developments are considered as the foundation of the modern precision clock. Wikipedia
Born: 1717, Paris, France
Died: 1785 (age 68 years), Vitry-sur-Seine, France
Parents: Julien Le Roy