Original Patent -Anton Raky in Erkelenz, Rhld. , 1902 , Tiefbohrvorrichtung mit schwingender Seiltrommel !!!

Published by Patentinhaber: Anton Raky in Erkelenz, Rhld.Patent: Tiefbohrvorrichtung mit schwingender Seiltrommel,von der das Bohrseil unmittelbar in das Bohrloch läuftPatentiert am: 19.12.1902K-2 
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