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英国采矿研究所研制的新型电池供电的便携式图表记录仪(见图),被认为是第一台经过安全火花鉴定,可以用在瓦斯矿井中的记录仪。
The new battery-powered portable chart recorder developed by the British Institute of Mining (see photo) is considered the first logger to be used in gas mines with safety spark identification.