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WebLongwall Mining: vantagem operacional 2,50 2,10 4,05 0,00 1,00 2,00 3,00 4,00 5,00 Produtividade padrão (Toneladas Curtas produzidas por trabalhador por hora) Longwall Convencional e outros Continuous Miner Fonte: U.S. Energy Information Administration, "Underground Coal Mining Productivity by State and ... Webprogress transferred to mta longwall system . 2g-3111a mining progress 11/14/78 950/460 vac, 3 ph, 60 hz with transferred to two 230 hp, two 125 hp and westfalia mining three 75 hp motors, longwall progress transferred to mta system . 2g-3112a service machine 11/14/78 950 vac, 3 ph, 60 hz with one 400 hp, two or three 200 hp, how heavy is too heavy for a weighted blanket
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