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Chinese workers migrated to the U.S to work in the gold mines, but they also took agricultural jobs along with factory work.
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They needed to keep exact time. Before this they ran according to timetables. For this to work, the engineers had to agree on the exact time at any point.
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The reason the Eiffel tower was built in Paris was because Gustave Eiffel's work was to show the boldness of the frenct
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