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<p>system uses pipes or ducts called transport lines that carry a mixture of materials and a stream of air. These materials are free flowing powdery materials like cement and <a href="page.php?w=fly_ash">fly ash</a>. Products are moved through tubes by <a href="page.php?w=air_pressure">air pressure</a>. Pneumatic conveyors are either carrier systems or dilute-phase systems; carrier systems simply push items from one entry point to one exit point, such as the money-exchanging <a href="page.php?w=pneumatic_tube">pneumatic tube</a>s used at a bank</p><p>
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