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Petroleum products, fuel, electricity and other sources of energy Construction work for pipelines, communication and power lines, for highways, roads, airfields and ra... Gravel Construction, foundation and surface works for highways, roads Fuels Heating works Coal Foundation work for highways, roads, streets and footpaths Construction work for highways, roads Electricity, heating, solar and nuclear energy Granules, chippings, stone powder, pebbles, gravel, broken and crushed stone, stone mixtures, sand-gr... Gravel, sand, crushed stone and aggregates Heating, ventilation and air-conditioning installation work Briquettes Parts of fuel, hand and concrete pumps

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