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GB970989A
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Improvements in or relating to yieldable connections for multi-member support constructions
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GB963152A
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Improvements in or relating to yieldable pit props
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GB947868A
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Clamping connection for mine support arches
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GB884908A
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Improved section iron for arched frames in mine galleries, tunnels or the like
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GB816728A
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A sectional roof-supporting arch with yieldable joints for underground workings
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GB814350A
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Improvements in roof supports for mine workings
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GB763906A
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Improvements in or relating to roadway supports for mines and the like
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GB709672A
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Improvements in or relating to arch support constructions in mines
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