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Conveyor system — Conveyor redirects here. For other uses, see Conveyor (disambiguation). This article is about conveyor systems. For information on conveyor belts, see conveyor belts. For information on overhead conveyors, see overhead conveyors. An overhead… … Wikipedia
Coal breaker — A coal breaking plant, depicted on a postcard in 1907. A coal breaker was a coal processing plant which broke coal into various useful sizes. Coal breakers also removed impurities from the coal (typically slate) and deposited them into a culm… … Wikipedia
postal system — System that allows persons to send letters, parcels, or packages to addressees in the same country or abroad. Postal systems are usually government run and paid for by a combination of user charges and government subsidies. There are early… … Universalium

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