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companies and bewehrungselement for ortbetonausbau in mining and tunnelling
companies and bewehrungselement for ortbetonausbau in mining and tunnelling
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机译:采矿和隧道运输中的ortbetonausbau公司和企业
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摘要
in the mining and tunnelling used verbundausbau consists essentially of locking related stahlsegmenten and a streckeninneren unidirectional reinforcement, with the space between the mountains and shut
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