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17
Rubber, gutta-percha, gum, asbestos, mica and goods made from these materials and not included in other classes; plastics in extruded form for use in manufacture; packing, stopping and insulating materials; flexible pipes, not of metal.
natural and synthetic gums, plastics, resins, and/or cements mixed and bonded with crushed abrasives in the form of erosion resistant linings or coatings on surfaces of tiles, pipes, conduits and shaped members which convey or hold abrasive mixtures
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19
Building materials (non-metallic); non-metallic rigid pipes for building; asphalt, pitch and bitumen; non-metallic transportable buildings; monuments, not of metal.
crushed abrasives, namely, basalt, granite, aluminia, furnace slag or igneous rock for forming abrasion-resistant linings or coatings for tiles, pipes, conduits, chutes, bunkers and bins which convey or hold abrasive mixtures
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37
Building construction; repair; installation services
[ installation, assembly and repair of shaped members namely, pipes, tubes, chutes, bulk material bunkers and bins, all having abrasive-resistant liners to protect against fretting wear, impact wear, and erosion and destruction, and to ensure slide capability of abrasives to be held or conveyed ]
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42
Scientific and technological services and research and design relating thereto; industrial analysis and research services; design and development of computer hardware and software
product development, namely, development of wear-resistant lined parts, namely, pipes, conduits, conveyors, chutes, bulk containers, and bins in installations which convey or hold abrasive bulk materials; consulting on mining conveyor installations in the field of bulk material moving