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矿山坑道用的已加工木料.枕木
Pit converted timber - Timber sleepers
参考页数:6P;A4
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矿山坑道用锯截木材.榫桩用木料
Cut pit timber; wood for cogs
参考页数:2P.;A4
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矿山坑道用锯截木材.方木材
Cut pit timber; square timber
参考页数:2P.;A4
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矿柱锯材.坑道托板.木垫板
Sawn pit timber; boards and planks
参考页数:2P.;A4
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矿山坑道用圆木.桩木,支撑柱
Round pit timber; pillar, supports
参考页数:2P.;A4
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矿井用圆木材.支拱用圆木
Round pit timber; timber for lagging
参考页数:1P.;A4
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矿山坑道用圆木.支撑,圆棒
Round pit timber; props, bars
参考页数:2P.;A4
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矿山坑道用圆木.支柱和圆棒的承荷能力.计算
Round pit timber; load bearing capacity of props and bars; calculation
参考页数:2P.;A4
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矿井支撑物.单立支撑的阀门.标识代码
Mine support; valves for individual props; identification code
参考页数:2P.;A4
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矿井支承.单立柱屋顶梁.试验和要求
Mine support; roof bars for single props; testing, requirements
参考页数:2P.;A4
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