-
-
Control systems
-
Patent number 4,692,067
-
Issue date Sep 8, 1987
-
Dobson Park Industries PLC.
-
Richard Ward
-
E21 - EARTH DRILLING MINING
-
Valves
-
Patent number 4,643,392
-
Issue date Feb 17, 1987
-
Dobson Park Industries PLC.
-
Richard Ward
-
G05 - CONTROLLING REGULATING
-
-
Valve assemblies
-
Patent number 4,617,954
-
Issue date Oct 21, 1986
-
Dobson Park Industries PLC.
-
Nigel J. Petts
-
E21 - EARTH DRILLING MINING
-
-
Connection devices
-
Patent number 4,586,867
-
Issue date May 6, 1986
-
Dobson Park Industries Plc
-
Raymond Stafford
-
E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING
-
Valve devices
-
Patent number 4,580,594
-
Issue date Apr 8, 1986
-
Dobson Park Industries PLC.
-
Nigel J. Petts
-
E21 - EARTH DRILLING MINING
-
Casting method and apparatus
-
Patent number 4,573,518
-
Issue date Mar 4, 1986
-
Dobson Park Industries PLC.
-
Richard Ward
-
B22 - CASTING POWDER METALLURGY
-
Mine roof supports
-
Patent number 4,563,111
-
Issue date Jan 7, 1986
-
Dobson Park Industries PLC.
-
James Seddon
-
E21 - EARTH DRILLING MINING
-
-
Underground support devices
-
Patent number 4,490,076
-
Issue date Dec 25, 1984
-
Dobson Park Industries PLC.
-
Archelaius D. Allen
-
E21 - EARTH DRILLING MINING