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PL285022A1
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Hydraulic system for advancing cylinders of self-advancing roof supports
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PL281752A1
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Piston, in particular for a hydraulic prop
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PL280611A1
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Ethod of and apparatus for pipeline laying in a tunnel
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PL280235A1
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Roof supports for a longwall with filling
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PL275268A1
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Method of and apparatus for handling individual sections of drill pipe string
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PL275000A1
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Drilling bit for drilling bore-holes in rocks
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PL274409A1
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Hydraulic prop, in particular centrally fed
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PL273232A1
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Method of and apparatus for manovering with lower end of pipestring in a drilling tower
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PL271484A1
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Roof support with an extendable and tiltable roof cap
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PL269738A1
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Bottom sprag of a moving wall lining,especially in soft sprags
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PL268971A1
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Apparatus for mounting and dismounting hubs ond and fromshafts as well as pulling out cylinder sleeves from their associated calinders
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HUT45579A
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Mine support
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PL256859A1
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Lemniscate-type mine lining
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PL255888A1
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Ground brace lifting mechanism for self-advancing roof supports
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PL255591A1
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Induction hardening method and apparatus
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PL254125A1
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Method of measuring operating supportability of a hydraulic worm and device therefor
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PL253148A1
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Electronic igniter circuit in particular for ignition gas burner flames in heating furnaces
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PL253109A1
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Hydraulic actuator
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PL252810A1
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Overhead mine railway
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PL251946A1
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Servomotor piston rod
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