| Patents for E21D 23 - Mine roof supports for step-by-step movement, e.g. in combination with provisions for shifting of conveyers, mining machines, or guides therefor (3,544) |
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| 04/08/1980 | US4197035 Shield-carrying roof support unit |
| 04/08/1980 | US4196934 Shortwall mining machine |
| 04/08/1980 | CA1075024A1 Friction guided, tracked trucks or sleighs for constructions such as retaining piers |
| 04/01/1980 | US4195953 Advance mechanism for a mine roof support assembly |
| 03/25/1980 | CA1074138A1 Mine roof supports |
| 03/11/1980 | US4192632 Support systems for mineral mining installations |
| 03/04/1980 | US4191498 Hydraulic roof support control system |
| 03/04/1980 | US4191497 Mine roof supports |
| 02/26/1980 | US4190292 Process for suppressing dust in mines |
| 02/26/1980 | CA1072352A1 Methods of and apparatus for applying roof mats to mine workings |
| 02/19/1980 | US4189258 Walking mine-roof support |
| 02/19/1980 | US4189257 Sheltering apparatus for use in long wall mining |
| 02/05/1980 | US4187042 Advance mechanism for a mine roof support unit |
| 02/05/1980 | US4186969 Apparatus for controlling the position of a mining machine |
| 01/22/1980 | US4184791 Mine roof support assembly |
| 01/15/1980 | US4183701 Coupling gear for lemniscate shield timbering frame |
| 01/15/1980 | US4183700 Walking mine support |
| 01/15/1980 | CA1069714A1 Mine roof support |
| 01/08/1980 | US4182585 Double-plate control device |
| 11/27/1979 | US4175891 Auxiliary walking mine support |
| 11/06/1979 | CA1065629A1 Mine roof supports |
| 10/02/1979 | US4169689 Tensioning a longwall mineral mining installation |
| 09/18/1979 | US4167998 Arrangement for tensioning a gateway conveyor in a sloping gateway |
| 08/08/1979 | EP0003342A1 Device to prevent pit linings from sliding away or tilting |
| 07/24/1979 | CA1059162A1 Mining apparatus and method |
| 07/24/1979 | CA1058894A1 Unit walking support |
| 07/17/1979 | US4161136 Hydraulic jack control device |
| 07/03/1979 | US4159671 Self-advancing mine roof supports |
| 06/19/1979 | US4158326 Control device |
| 06/12/1979 | CA1056170A1 Mobile supporting pile |
| 05/22/1979 | US4155676 Hydraulic walking roof-support frame |
| 05/22/1979 | US4155675 Hydraulic walking roof-support frame |
| 05/22/1979 | US4155375 Multiple valve control device |
| 05/15/1979 | US4155004 Photoelectric transducing unit and system for detecting the sharpness of the image of object by means of the unit -and- a focusing arrangement |
| 05/01/1979 | CA1053683A1 Thiazole derivatives and process for preparing same |
| 04/17/1979 | US4149567 Multi-core hydraulic duct |
| 04/03/1979 | US4147459 Shifting device connected with a longwall conveyor for a progressive timbering frame |
| 03/27/1979 | US4146271 Control of self-advancing mine roof supports |
| 03/13/1979 | US4143991 Mine roof support system |
| 02/20/1979 | US4140430 Walking mine roof support |
| 02/13/1979 | US4139326 Mine roof supports |
| 02/13/1979 | US4139325 Mine roof supports |
| 01/30/1979 | US4136999 Canopy and shield structure for a supporting shield in a seam-like mine deposit |
| 01/23/1979 | CA1046780A1 Method and apparatus for supporting the roof of an underground mine working |
| 01/16/1979 | US4134270 Mine roof support control |
| 01/02/1979 | US4132081 Mine roof support |
| 01/02/1979 | US4132079 Apparatus for remotely operating self-advancing supports or the like |
| 12/26/1978 | US4131317 Mining machine having advancing mine roof supports |
| 12/19/1978 | US4129990 Advancing support |
| 11/28/1978 | US4127303 Coal mining method at a long-walled pit face of the coal mine |
| 11/21/1978 | US4126002 Mine roof support |
| 11/21/1978 | CA1042675A1 Mine roof supports |
| 11/14/1978 | US4124984 Mine roof supports |
| 11/07/1978 | CA1041778A1 Mining equipment |
| 10/31/1978 | US4122682 Methods of and apparatus for applying roof mats to mine workings |
| 10/24/1978 | US4121426 Mine roof support unit and assembly |
| 10/10/1978 | US4119346 Longwall mining system |
| 10/10/1978 | US4118939 Mine roof support |
| 10/03/1978 | US4117687 Mine roof supports |
| 09/19/1978 | US4114387 Mine roof support |
| 09/19/1978 | US4114385 Roof support |
| 09/12/1978 | CA1038255A1 Power transmission |
| 09/05/1978 | US4111227 Pressure relief valve for hydraulic mine supporting elements |
| 09/05/1978 | CA1037974A1 Mining method and apparatus |
| 08/29/1978 | US4109473 Roof supports |
| 08/29/1978 | US4109472 Longwall mining apparatus |
| 08/22/1978 | US4107931 Progressive timbering device |
| 07/25/1978 | US4102550 Mining method and apparatus |
| 07/25/1978 | US4102140 Self-advancing mine roof supports |
| 07/25/1978 | US4102139 Mining equipment |
| 07/11/1978 | US4099785 Method and apparatus for supporting the roof of an underground mine working |
| 07/11/1978 | US4099781 Apparatus for automatically shifting the conveyor at the pit face in the coal mine |
| 06/27/1978 | US4096753 Mine equipment |
| 06/20/1978 | US4095616 Hydraulic controller |
| 06/13/1978 | US4094155 Mine roof support |
| 06/13/1978 | US4094154 Roof prop apparatus and method for longwall mining |
| 06/13/1978 | US4094153 Breast roof support system for longwall mining |
| 06/06/1978 | US4092831 Roof bar for surface support elements |
| 05/30/1978 | US4091627 System and equipment for operating self-advancing supports |
| 05/16/1978 | US4089182 Equipment for remotely operating self-advancing supports used at the pit face in a coal mine |
| 05/16/1978 | US4089181 Canopy and shield structure for supporting a shield in a seam-like mine deposit |
| 04/25/1978 | US4085592 Shield tubbing for longwalls |
| 04/04/1978 | US4082360 Mining apparatus and method |
| 03/28/1978 | US4080794 Arrangement for supporting roofs of underground excavations |
| 03/07/1978 | US4077223 Roof support shield structure for use in an excavation |
| 02/28/1978 | US4075857 Shield-type support assemblies for mine workings |
| 02/14/1978 | US4073151 Mine roof support assemblies |
| 02/14/1978 | US4073150 Suspended valve control device |
| 02/14/1978 | US4073149 Mine roof support assemblies |
| 02/07/1978 | US4072351 Radial mining method |
| 01/10/1978 | US4067618 Apparatus for protecting of coal mine workers |
| 01/03/1978 | US4065931 Guiding arrangement for underground excavating systems |
| 01/03/1978 | US4065930 Mine roof support |
| 01/03/1978 | US4065929 Mine roof support and method in longwall mining of thick mineral seams |
| 12/27/1977 | US4064701 Hydraulic shield assembly |
| 12/13/1977 | US4062194 Mine roof supports |
| 11/08/1977 | US4056941 Mine roof support for an underground mine gallery |
| 09/27/1977 | US4050256 Mine roof support control systems |
| 09/20/1977 | US4049960 Focusing arrangement |
| 09/20/1977 | US4049014 Power transmission |