original Patent - Rudolf Fritz , Heidelberg , 1885 , Abdichten verrohrter Bohrlöcher | Rohr | Dichtung , Bergbau !!

Published by Patentinhaber:Rudolf Fritz , HeidelbergPatent:Vorrichtung zum Abdichten verrohrter Bohrlöcher gegen das Eindringen des TagewassersPatentiert am: 05.04.1885 P-310
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