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GB780345A
|
|
Improvements in hydraulic supporting or lifting devices
|
|
GB759948A
|
|
Improvements in adjustable metal pit prop for underground mine workings
|
|
GB734554A
|
|
Improvements in or relating to pit props
|
|
GB774109A
|
|
Improvements in or relating to mine roof support assemblies
|
|
GB780475A
|
|
Improvements in or relating to hydraulic pit props
|
|
GB748222A
|
|
Improvements in or relating to telescopically adjustable pit props
|
|
GB737748A
|
|
Improvements in or relating to adjustable hydraulic mine props or the like
|
|
GB781004A
|
|
Improvements in or relating to adjustable hydraulic mine props
|
|
GB690223A
|
|
Improvements in or relating to pit props
|
|
DE818485C
|
|
Pit stamp
|
|
DE816843C
|
|
Adjustable iron pit stamp
|
|
DE905002C
|
|
Setting device for pit stamp
|
|
DE721430C
|
|
Pit punch-shell iron connection
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