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GB754103A
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Improvements in mine roof supporting archways
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GB738484A
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Archway structures for supporting mine roofs
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GB741724A
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Improvements in or relating to mine gallery or like lining and supporting structures
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GB722508A
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Improvements relating to polygonal and arched structures for use in mining
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GB719458A
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Improvements in and relating to arched supports for mine galleries
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GB531354A
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Improvements in jig conveyors and actuating mechanism therefor
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GB504955A
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An improved method for pulling down pit-props or pillars and means therefor
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GB507921A
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Improvements in devices for pulling down pit props
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GB477011A
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Improvements in or relating to shoring structures for mines
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GB409954A
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Improvements in caps for pit props and like supports
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GB404458A
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Improvements relating to shoring mine passages, adits and the like
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