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·1832 cyrus mccormick develops the mechanical reaper · 1837 john deere patents the steel plow · 1892 john froelich builds the first gasoline-powered tractor · 1895 refrigertion techniques developed in the u. s. which sector of the american economy would have been impacted most by the developments listed in this timeline? a) the energy sector b) the industrial sector c) the agricultural sector d) the communications sector
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