Question

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what year did james watt introduce his improved version of the steam engine? 1781 1776 1787 rewatch submit

Explanation:

James Watt introduced his improved version of the steam engine in 1781. Historical records indicate that in 1781, Watt patented the rotative steam engine, which was an improved version of the earlier steam engine designs.

Answer:

1781 (the option with "1781")