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Tunnel
A tunnel is an underground passageway, dug through the surrounding soil/earth/rock and enclosed except for entrance and exit, commonly at each end. A pipeline is not a tunnel, though some recent tunnels have used immersed tube construction techniques rath
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China Coal Mining Equipment, Find details about China Coal Mining Equipment, Coal Roadheader from Coal Mining Equipment - Shanghai Kemei Electro Mechanical Co., Ltd.
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You can also check the Durham Mining Museum and Ian Winstanley's Site. I have also used 'A Pit Terminology - Glossary Used in Coal Mining' a publication compiled by William Stukeley Gresley, dated 1883 and given to me by Philip Wyles.
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List of Approved Items - Electrical: Directorate General Of
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