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US3667621A
(en)
|
|
Fluid power system for a self-contained unloading unit
|
|
US2352390A
(en)
|
|
Hydraulic jack
|
|
GB1126940A
(en)
|
|
A multi-stage telescopic hydraulic pit prop
|
|
GB1210015A
(en)
|
|
Pressure indicating apparatus for hydraulic mine roof support rams
|
|
US3840047A
(en)
|
|
Hydraulic apparatus
|
|
GB1314490A
(en)
|
|
Retractable ejector devices
|
|
US4506871A
(en)
|
|
Retracting clamp
|
|
PL61340B1
(enExample)
|
|
|
|
US3656411A
(en)
|
|
Telescopic props
|
|
US5936168A
(en)
|
|
Dual injector cylinder automatic insertion device for use with high pressure pipelines
|
|
US3109283A
(en)
|
|
Cartridge actuated thruster
|
|
US4042280A
(en)
|
|
Method of breaking up objects
|
|
PL60677B1
(enExample)
|
|
|
|
US3281108A
(en)
|
|
Hydraulic support prop
|
|
US3326524A
(en)
|
|
Hydraulic systems for chain tighteners and the like
|
|
US2927377A
(en)
|
|
Opening and closing device for well bore caliper
|
|
GB735294A
(en)
|
|
Improvements relating to fluid-operated roof-supporting units for use in mines and like places
|
|
US3045649A
(en)
|
|
Double acting tool and die cylinder
|
|
GB1131356A
(en)
|
|
Shifting device for longwall conveyors
|
|
GB1425153A
(en)
|
|
Devices for use in measuring gas flow
|
|
US2888231A
(en)
|
|
Roof supports
|
|
GB754108A
(en)
|
|
Hydraulic roof supports for mines
|
|
RU2161253C1
(ru)
|
|
Силовой гидроцилиндр
|
|
GB1082257A
(en)
|
|
Bracing device particularly suitable for use at the end of a face conveyor at a coal face where a coal plough is employed
|
|
DE1138366B
(de)
|
|
Ausziehbares, zweiteiliges Grubenausbau-element
|