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GB839211A
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Mine roof bars
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GB823459A
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Arched frames for underground levels
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GB779463A
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Improved collapsible chock for use in mines
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GB777619A
|
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An improved pit prop
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ES220463A1
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Improvements in mining points (Machine-translation by Google Translate, not legally binding)
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DE1057039B
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Wedge arrangement for the lock of a pit punch with a split inner punch
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GB758867A
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Improvements in cotters for coupling mine-roof support girders to one another
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GB718352A
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Improvements in or relating to bars for supporting mine roofs or the like
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DE972849C
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Pit stamp
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GB706020A
|
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Improvements in means for assembling mine roof supporting beams
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GB662201A
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Improvements in locking arrangements for metal stanchions or pit props
|
|
GB700002A
|
|
Improvements in means for assembling supporting beams
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GB663531A
|
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Improvements in mine props
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