Elevators and conveyors Tenders , Pneumatic elevators or conveyors Tenders , Passenger elevators Tenders , Bucket-type, continuous-action elevators or conveyors Tenders , Belt-type continuous-action elevators or conveyors Tenders , Building construction work Tenders , construction work for cold-storage installations Tenders , construction work for agricultural buildings Tenders , construction work for mountain-rescue building Tenders , construction work for drainage,sewerage,highways, roads, airfields and railways Tenders , Drainage construction works Tenders , Construction works for plants, mining and manufacturing and for buildings relating to the oil and gas industry Tenders , Concrete work Tenders , Electrical installation work Tenders , Other Electrical installation work Tenders , Plumbing and sanitary works Tenders , Installation of plumbing and heating equipment Tenders , Water distribution Tenders , Operation of electrical installations Tenders