chain-and-scraper conveyor

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• Longwall mining — is a form of underground coal mining where a long wall (typically about 250 400 m long) of coal is mined in a single slice (typically 1 2 m thick). The longwall panel (the block of coal that is being mined) is typically 3 4 km long and 250 400 m… …   Wikipedia

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• instrumentality — I (New American Roget s College Thesaurus) Means to an end Nouns 1. instrumentality; instrument, aid; subservience, subserviency; vehicle, hand, expedient (see plan); means, agency. 2. (means) stepping stone; [master or skeleton] key, latchkey,… …   English dictionary for students