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DE2061266A1
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Settling tank sludge remover - using air lift pump just above sludge surface
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US3649078A
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Steerable guide rail for longwall mining apparatus
|
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GB1299011A
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A control system for self-advancing hydraulic roof supports for longwall faces in mines
|
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DE1947822A1
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Rubber band with reinforcing insets
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US3563040A
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Connecting device for roof support frames
|
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GB1272759A
|
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Improvements in or relating to the longwall mining of coal and other minerals
|
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GB1241192A
|
|
Improvements in or relating to the longwall mining of coal and other minerals
|
|
GB1293342A
|
|
Improvements in or relating to the longwall mining of coal and other minerals
|
|
US3541926A
|
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Control system for a stepping hydraulic roof propping system
|
|
GB1222997A
|
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A control system for self-advancing hydraulic roof supports for longwall faces in mines
|
|
US3494668A
|
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Method and apparatus for the winning of coal by the long wall support system
|
|
GB1209965A
|
|
Method and apparatus for the winning of minerals by long wall mining
|
|
DE1270515B
|
|
Device for braking mountain conveyance or inclined shaft conveyance
|
|
US3452683A
|
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Cog driven rack rail locomotive
|
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DE1259773B
|
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Endless intermediate drive for conveyor chains
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DE1274965B
|
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Mobile conveyor
|
|
GB1179163A
|
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A Mobile Chassis for Articulated Conveyors.
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|
GB1176703A
|
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Improvements in or relating to Locomotives for Propelling Conveyor Trains.
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|
DE1266709B
|
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Material transport device for driving underground tunnels, routes or the like.
|
|
DE1277777B
|
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Equipment for the extraction of coal in long-front construction with a circulating chain
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