Safety Lamps - Wikipedia

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A safety lamp is any of several types of lamp that provides illumination in coal mines and is designed to operate in air that may contain coal dust or gases, both of which are potentially flammable or explosive. Until the development of effective electric lamps in the early 1900s miners used flame lamps to provide illumination.

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abuhurairah 2 meses, 4 semanas atrás
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