Building and mining machines and their components, particularly mining/winning machines including coal ploughs, coal augers, machines for loading and/or transporting mining products and other bulk materials; advance drive means for mining/winning machines including toothed racks and pinion racks; conveyors (as far as included in class 7) including mining conveyor systems, continuous conveyors for bulk material, particularly scraper chain conveyors, including curve conveyors, and roller curves, belt conveyors, platform conveyors, link conveyors, perpendicular conveyors, disc retarding conveyors, worm conveyors, vibrating conveyors, bunker discharge conveyors, pneumatic conveying apparatus, parts of the said conveyors including conveyor pans, pan conveyor connections, driving stations and scrapers; powered anchorage or shifting devices for anchoring or shifting conveyor means and their drive means, parts of the anchorage and shifting devices including guide rods and walking troughs; guide means for mining machines, plough guidances and chain guidances for plough chains, guidances and chain guidances for coal augers, side-plates for conveyors, cable ducts, bits and bit holders; chains, chain wheels and chain drums; mechanical chain-tension devices, tentering frames

Repair and maintenance of mining machines and parts thereof