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Reference.org
Cap lamp
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<p>A cap lamp is a lamp worn on the head or helmet. It is mostly used in an underground environment, like <a href="/facts/Mining/g6uDIFab">mines</a> or during <a href="/facts/Outdoor_activity/WGef0TFr">outdoor activities</a>, e.g. <a href="/facts/Climbing/oIqfUWuL">climbing</a>. </p>