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

Did Watt work as a mathematical- instrument maker from the age of 19? (общий)Watt worked as a mathematical- instrument maker from the age of 19, didn't he? (разделит.)Who worked as a mathematical- instrument maker from the age of 19? (вопр. к подлежащ.)When did Watt start working as a mathematical- instrument maker? (спец.)Watt worked as a mathematical- instrument maker or an engineer? (альтернат.)