| 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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| 09/20/1983 | CA1153901A1 Mineral mining installation |
| 09/06/1983 | US4402634 Mineral mining installation |
| 08/30/1983 | US4401399 Two part mine roof support unit |
| 08/16/1983 | USRE31346 Advance mechanism for a mine roof support assembly |
| 08/16/1983 | US4398851 Arrangement for controlling advancing timbering in underground mining |
| 07/26/1983 | US4394875 Actuator for a mine roof support unit |
| 07/05/1983 | US4391469 Mineral mining installation |
| 07/05/1983 | US4391181 Hydraulic control systems for mining apparatus |
| 06/28/1983 | US4390308 Advance mechanism for a mine roof support assembly |
| 06/07/1983 | US4386878 Mining equipment, mainly for extraction of heavy beds |
| 05/17/1983 | CA1146369A1 Sliding propping gantry |
| 05/10/1983 | US4382722 Nine lining structure |
| 04/19/1983 | US4380410 Mine-roof support |
| 04/12/1983 | US4379662 Control device for an advancing support in underground mining |
| 04/12/1983 | US4379661 Advance mechanism for a mine roof support unit |
| 03/29/1983 | US4378027 Control unit for an electro-hydraulic roof support control arrangement |
| 02/08/1983 | US4372618 Self-advancing mineral mining installation including tilting machine support |
| 01/11/1983 | CA1139118A1 Mine roof support |
| 12/28/1982 | CA1138303A1 Hydraulic control apparatus for controlling the operation of mine roof support props |
| 12/07/1982 | CA1136871A1 Roof supports |
| 11/09/1982 | US4358224 Continuous sliding support gantry for a large passage |
| 10/05/1982 | US4352602 Roof support for a mine gallery which extends at a relatively large angle inclined to the horizontal |
| 09/07/1982 | US4348138 Sliding supporting gallery |
| 08/31/1982 | US4347021 Mine roof supports |
| 08/17/1982 | CA1129661A1 Underground mining roof support systems and supports for use with such systems |
| 06/09/1982 | EP0053270A1 Arrangement for the control of a self-advancing support in underground mining |
| 05/18/1982 | US4330226 Roof-support distancing apparatus |
| 05/18/1982 | US4330154 Mining apparatus |
| 05/04/1982 | US4327628 Hydraulic roof support control system |
| 04/20/1982 | US4325659 Mineral mining installation |
| 04/20/1982 | CA1122022A1 Mine roof supports |
| 04/13/1982 | US4324510 Apparatus for supporting a mine roof support assembly |
| 04/13/1982 | US4324509 Mechanized longwall system for mining |
| 04/06/1982 | US4323002 Hydraulic equipment |
| 04/06/1982 | CA1121300A1 Chromium electroplating |
| 02/02/1982 | US4313698 Hydraulic shield-type support |
| 01/26/1982 | US4312609 Mine roof support system |
| 01/19/1982 | US4311417 Mine roof support |
| 01/19/1982 | CA1116423A1 Mine roof support system |
| 01/12/1982 | US4310268 Mining equipment |
| 01/12/1982 | US4310197 Mining and bolting method and apparatus |
| 01/12/1982 | US4310027 Hydraulic control devices for use with mining apparatus |
| 01/05/1982 | US4309131 Mine roof support |
| 01/05/1982 | US4309130 Mine roof support |
| 12/30/1981 | EP0042479A1 Goaf screen |
| 12/29/1981 | US4307982 Mobile mine roof support system |
| 12/29/1981 | US4307981 Mineral mining installation |
| 12/22/1981 | US4306822 Hydraulic control means |
| 12/22/1981 | CA1114626A1 Mine roof support |
| 11/10/1981 | US4299517 Mine roof supporting structure |
| 10/27/1981 | CA1111265A1 Mine roof supports |
| 10/20/1981 | CA1110859A1 Buttressed sprag plate |
| 10/06/1981 | US4293248 Walking roof support |
| 10/06/1981 | US4293247 Seals for mine roof supports |
| 10/06/1981 | US4293246 Mine roof support structure |
| 10/06/1981 | CA1110091A1 Mine roof or rock bolt expansion anchor of the bail type |
| 09/08/1981 | CA1108420A1 Mine roof supports |
| 08/11/1981 | CA1106734A1 Hydraulic equipment |
| 08/11/1981 | CA1106732A1 Double-plate control device |
| 08/05/1981 | EP0033152A1 Mining roof support, in particular shield-type support |
| 06/23/1981 | US4274765 Mining equipment |
| 06/23/1981 | US4274764 Mine roof supporting system |
| 06/23/1981 | CA1103470A1 Mine roof support system |
| 06/09/1981 | US4272129 Mineral mining installation |
| 06/09/1981 | CA1102827A1 Underground mining machine |
| 05/26/1981 | US4269547 Tunnel roof supporting apparatus |
| 05/26/1981 | US4269546 Mine working apparatus |
| 05/19/1981 | US4268193 Mine roof supports |
| 05/12/1981 | US4266892 Hydraulic roof-support frame |
| 05/12/1981 | US4266891 Support assemblies for mine workings |
| 04/28/1981 | US4264237 Method for controlling a hydraulically operated mine roof support and an arrangement for carrying out the method |
| 04/21/1981 | US4263005 Device for provisionally consolidating a gallery and suitable consolidating frame |
| 02/24/1981 | US4252477 Mine roof support |
| 02/03/1981 | US4248136 Thrust device using hydraulic jacks |
| 02/03/1981 | CA1094833A1 Device for provisionally consolidating a gallery and suitable consolidating frame |
| 01/27/1981 | US4247226 Hydraulic conduit systems for mine installations |
| 01/27/1981 | US4247135 Hydraulic coupling device |
| 01/20/1981 | CA1093938A1 No translation available |
| 12/30/1980 | US4242014 Pivot joint for underground mining installations |
| 12/24/1980 | WO1980002859A1 Mechanized support unit |
| 12/23/1980 | US4240666 Device for mining of thick strata of useful minerals |
| 12/16/1980 | CA1091460A1 Gallery walking lining |
| 12/02/1980 | US4236850 Shield timbering frame for timbering mines |
| 11/11/1980 | US4232911 Carriage with articulated track |
| 11/04/1980 | US4231685 Roof support unit |
| 11/04/1980 | US4231684 Shield type support for use in underground mining with lemniscate guide rods |
| 10/21/1980 | US4229043 Cowl arrangements for mining machines |
| 10/14/1980 | US4228508 Automatic longwall mining system and method |
| 10/14/1980 | US4227833 Mineral mining installation |
| 10/07/1980 | US4226558 Control system |
| 09/30/1980 | US4225271 Hydraulically operated mine roof support and a control arrangement thereof |
| 09/16/1980 | US4222686 Mine roof support |
| 09/02/1980 | US4220424 Valve arrangement for a walking mine roof support |
| 08/12/1980 | US4217067 Mine roof support assembly |
| 08/06/1980 | EP0014188A1 Chock |
| 07/22/1980 | CA1081976A1 Mine roof support assembly |
| 05/20/1980 | CA1077973A1 Radial mining method |
| 05/20/1980 | CA1077730A1 Mobile continuous bracing pile |
| 04/22/1980 | US4199193 Underground mining machine having temporary roof support means and roof bolting means associated therewith |
| 04/15/1980 | CA1075480A1 Mine roof supports |