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GB1127542A
|
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Conveyors and roof supports for mines
|
|
GB946939A
|
|
Improvements in or relating to coal-face supports
|
|
US3077741A
|
|
Shiftable mine prop arrangement and process for shifting mine props
|
|
GB874435A
|
|
Advancing mine roof support structure for mine working faces
|
|
US2987290A
|
|
Prop arrangement for mines
|
|
GB848815A
|
|
A pit prop for mine workings
|
|
GB843957A
|
|
A supporting arrangement for the roof of workface gallerles in mines
|
|
GB848751A
|
|
Advancing support system for mine workings
|
|
GB724397A
|
|
Improvements in or relating to cutting machines for mines
|
|
GB774575A
|
|
Improvements in or relating to drift support systems for mines
|
|
GB774574A
|
|
Improvements in or relating to drift support systems for mines
|
|
GB711760A
|
|
Conveyor bar for scraper conveyors
|
|
GB699838A
|
|
Improved pit prop
|
|
GB707062A
|
|
Improvements in or relating to cutting machines for mines
|
|
US2670170A
|
|
Pit prop
|
|
GB669876A
|
|
Improved pit prop
|
|
GB654868A
|
|
Improvements relating to a method and apparatus for mining
|
|
GB495781A
|
|
Improvements in or relating to pit props
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