Manufacture/repair of other oilfield and gasfield machinery and equipment

This sub-class includes the manufacture and/or repair of other oilfield and/or gasfield machinery and/or equipment, such as: - oilfield and/or gasfield derricks and/or tool joints - continuous-action elevators and/or conveyors for underground use in oilfield and/or gasfield - boring, cutting, sinking and/or tunnelling machinery (whether or not for underground use) in oilfield and/or gasfield - machinery for treating minerals by screening, sorting, separating, washing, crushing, etc. in oilfield and/or gasfield - earth-moving machinery (e.g., bulldozers, angle-dozers, graders, scrapers, levellers, mechanical shovels, shovel loaders) in oilfield and/or gasfield - track-laying tractors and/or tractors used in oilfield and/or gasfield