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GB797707A
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A method and an apparatus for ascertaining the load carrying capacity of telescopic components of mine roof supporting structures
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GB813634A
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Chain-cutting coal-mining machine
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GB763388A
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Mining machine for use in mineral seams
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GB764194A
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Hydraulic pit props
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GB764498A
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Improvements in coal mining devices
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GB769328A
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A new and improved mineral mining machine
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GB725958A
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Improvements in mine roof supports
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ES204458A1
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A procedure for the extraction and use of carbons (Machine-translation by Google Translate, not legally binding)
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GB711105A
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Process for the conveyance and utilisation of coal
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GB722453A
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A method and a machine for mining minerals by planning it from the face of a seam
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GB705542A
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|
A process for the recovery of germanium from tar residues
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GB704290A
|
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A method for testing the mechanical strength of coal and a device for carrying out the method
|
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DE878632C
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Process for the extraction and utilization of coal
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DE859970C
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Process for measuring the carbon strength and equipment for carrying out the process
|
|
DE888177C
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|
Process for the processing of tar residues
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|
DE845425C
|
|
Process for measuring the carbon strength and equipment for carrying out the process
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DE828175C
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Collar connection for pipes to convey grainy substances
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DE875334C
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|
Two-part steel pit stamp
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DE809415C
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|
Single chain conveyor
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GB668322A
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Improvements in frame-coal cutters
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