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Contraband (coal mine)
Contraband in coal mines means items which not allowed to be taken underground in a coal mine because if there is firedamp about they may start a fire or explosion. This includes: matches, tobacco and other smoking materials, anything that may cause sparks, anything with electric comnponents except what has been safety-approved. They have to be declared before going down and left there, and collected after coming out of the mine.〔http://www.dmm-pitwork.org.uk/html/defs.htm〕
==References==
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抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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