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Here you can see the former pit bank of Koenigsborn colliery in
Unna (Germany). In earlier times, when the colliery was still producing hard
coal, in the middle of the four vertical metal pillars the shaft was situated.
On the right there is the large pipe for the methane gas that is still pouring
out of the shaft.
©
Jan Bruensing (LEK RWTH Aachen)
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