-
-
-
-
-
-
-
-
-
-
-
Mining apparatus
-
Patent number 4,330,154
-
Issue date May 18, 1982
-
Dowty Mining Equipment Limited
-
Robert G. Harris
-
E21 - EARTH DRILLING MINING
-
-
-
Mine roof support control
-
Patent number 4,134,270
-
Issue date Jan 16, 1979
-
Gullick Dobson Limited
-
Fred Small
-
E21 - EARTH DRILLING MINING
-
Longwall mining apparatus
-
Patent number 4,109,472
-
Issue date Aug 29, 1978
-
Dowty Mining Equipment Limited
-
Robert G. Harris
-
E21 - EARTH DRILLING MINING
-
3495499
-
Patent number 3,495,499
-
Issue date Feb 17, 1970
-
E21 - EARTH DRILLING MINING
-
3285015
-
Patent number 3,285,015
-
Issue date Nov 15, 1966
-
E21 - EARTH DRILLING MINING