original Patent - Dr. Carl Roth , Berlin / Charlottenburg , 1887 , Zünder für Zündschnuren | Sprengstoff , Bergwerk !!!

Published by Patentinhaber:ÂDr. Carl Roth , Berlin / CharlottenburgÂPatent:ÂSicherheitszünder für Zündschnuren zur Verhütung von Schlagwetter-ExplosionenPatentiert am:Â06.07.1887P-231
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