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Invented the seed drill.
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Author of Wealth of Nations.
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Improved the steam engine.
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Invented the spinning mule.
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Invented the reverberatory furnace.
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Developed the process for making soda ash.
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Invented the cotton gin.
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Invented the first electrical battery.
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Introduced in Principles of Political Economy and Taxation was the theory of comparative advantage.
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Invented the first practical sewing machine.
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Published The Communist Manifesto.
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Invented the first telegraph cable.