WP should be more than wrist-watch parts identification for the amateur horologer.
2.
Reputed to be the youngest master horologer in the world, the 39-year-old Muller seemed very pleased with his latest creation.
3.
The chronometers he thus refined with Ferdinand Berthoud for their later experiments were the object of major struggles with the king's horologer, Pierre Le Roy.
4.
Their first child, Laurent Chappuzeau, was born in Lyon before 1655 . ( Laurent later became " horologer ", or clockmaker, to the Elector of Hanover)
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