In order to demonstrate the size and the
strength a shield has been placed close to the gate of the Ost colliery in
Hamm-Pelkum (Germany). Under the shields the large hydraulic cylinders can be
seen that make it possible to push the shields upwards against the roof.
At the bottom you can see the space where the
face chains are placed in order to bring the extracted raw coal out of the longwall
mining area.
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