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2. AOL Mail

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   Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

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4. Air conditioning - Wikipedia

   en.wikipedia.org/wiki/Air_conditioning

   This compressor use two very closely meshing spiral rotors to compress the gas. The gas enters at the suction side and moves through the threads as the screws rotate. The meshing rotors force the gas through the compressor, and the gas exits at the end of the screws. The working area is the inter-lobe volume between the male and female rotors.

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6. Mechanical engineering - Wikipedia

   en.wikipedia.org/wiki/Mechanical_engineering

   Various machine components used in mechanical engineering. Mechanical engineering is the study of physical machines that may involve force and movement. It is an engineering branch that combines engineering physics and mathematics principles with materials science, to design, analyze, manufacture, and maintain mechanical systems. [1]

7. Economic history of the United States - Wikipedia

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   The 1860s were a period of growing protectionism in the United States, while the European free trade phase lasted from 1860 to 1892. The tariff average rate on imports of manufactured goods in 1875 was from 40% to 50% in the United States, against 9% to 12% in continental Europe at the height of free trade. [44]