31st January 2014, 09:31 PM
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Engineer
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Full Name: Christoph Beyer
Join Date: Sep 2012
Location: germany
Posts: 945
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did some 'research' 
They invented the 'koepe-foerderung' for the shaft in bochum, it's illustrated here:
http://www.lwl.org/LWL/Kultur/wim/po...pe_Foerderung/
cheers
chris |