Mineral mining installation
A mineral mining installation comprises a roof support unit and an advance mechanism. The roof support unit has a floor sill constituted by two floor girders. The advance mechanism comprises a hydraulic advance ram, the advance ram having a relatively-displaceable cylinder and a piston rod, and a de...
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| Hauptverfasser: | , , , , , |
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| Format: | Patent |
| Sprache: | eng |
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