Image:Davy lamp.png

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Description: en:Davy lamp (safety lamp for use in coal mines)

Source: Bibliothek allgemeinen und praktischen Wissens für Militäranwärter Band III, 1905 / Deutsches Verlaghaus Bong & Co Berlin * Leipzig * Wien * Stuttgart


Author: Scan made by Kogo

License: Public Domain, because copyright expired

Public domain This image (or other media file) is in the public domain because its copyright has expired.

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