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GB1248694A
|
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Improvements in mine roof support assemblies
|
|
GB1158427A
|
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Vertical Malting Tower
|
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GB1103800A
|
|
Improvements relating to mechanically advancing mine roof support systems
|
|
GB1070710A
|
|
Improvements relating to pit props
|
|
GB1088993A
|
|
Improvements relating to swing-up cylinder devices and roof support systems including such cylinders
|
|
GB1069909A
|
|
Improvements in or relating to mechanical force amplifying means
|
|
GB1037142A
|
|
Improvements relating to friction-type pit props
|
|
GB1033788A
|
|
Support chock for mine roofs
|
|
GB994903A
|
|
Improvements in friction-type pit props
|
|
GB1000733A
|
|
Connecting elements for mine roof support members
|
|
US3201943A
|
|
Mine roof support
|
|
GB929528A
|
|
An improved piston packing for hydraulic pit props
|
|
US3055463A
|
|
Expandable assemblies
|
|
GB962576A
|
|
Improvements in or relating to clamping devices
|
|
GB971697A
|
|
Improvements in mine roof supports and advancing mechanisms therefor
|
|
GB883407A
|
|
Improvements in mine roof support assemblies
|
|
DE1240112B
|
|
Steel bridge with an overhead deck made of reinforced concrete and main girders running through more than two supports
|
|
GB907055A
|
|
Improvements in or relating to mine roof supports
|
|
GB909178A
|
|
Improvements in or relating to mining gallery support structures
|
|
GB905291A
|
|
Gallery support for underground mining
|
