work ( ) buildings, prefabricated ( ) roadlaying - contractors ( ) consultants - construction and civil engineering ( ) architects - consultants ( ) railways - laying and maintenance ( ) marine, port and underwater works - contractors ( ) raw materials for construction and public works ( ) concrete...
joinery and carpentry - works ( ) hydroelectric factories ( ) heating and air conditioning - works ( ) electronic data processing - software ( ) gas and oil - exploitation ( ) water - production and distribution ( ) hi-fi, television and video accessories ( ) plumbing - works ( ) thermal insulation materials...