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Watt worked as a mathematical- instrument maker from the age of 19.

Watt worked as a mathematical-instrument maker from the age of 19.1 Did Watt work as a mathematical-instrument maker?2 Who worked as a mathematical-instrument maker from the age of 19?3 Did Watt work as a mathematical-instrument maker from the age of 19 or 21?4 Watt worked as a mathematical-instrument maker, didn't he? 5 From what age did Watt work as a mathematical-instrument maker?