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| Keywords: Davy lamp.png en en Davy lamp a safety lamp for use in coal mines Bibliothek allgemeinen und praktischen Wissens für Militäranwärter Band III 1905 / Deutsches Verlaghaus Bong Co Berlin Leipzig Wien Stuttgart Scan made by Kogo ' PD-old Davy lamp Humphry Davy Drawings of mining lamps | ||||
