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Class Information
Number: 405/302
Name: Hydraulic and earth engineering > Earth treatment or control > Shoring, bracing, or cave-in prevention > Roof support > Jack > Mobile > Control system
Description: Method or apparatus for supply of motive energy to the prop via a regulating circuit to actuate the prop.

Patents under this class:
1 2 3

Patent Number Title Of Patent Date Issued
4109472 Longwall mining apparatus Aug. 29, 1978
4091627 System and equipment for operating self-advancing supports May. 30, 1978
4089182 Equipment for remotely operating self-advancing supports used at the pit face in a coal mine May. 16, 1978
4050256 Mine roof support control systems Sep. 27, 1977

1 2 3

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