1971 – Commencement of the factory construction
1974 – Commencement of production, start-up of the water-tube boilers production
1975 – Full production capacity of the Ist stage of the project
1976 – Commencement of the IInd stage of construction (extension of the production hall, construction of high storage warehouse)
1980 – Completion of IInd stage of construction
1983 – Commissioning of gas-tight walls line for operation
1985 – Commencement of the gas-tight walls, WRp type boilers production
1991 – Commencement of preparatory works for the company privatization
1994 – Transformation of the company into a joint-stock company
1997 – Obtaining ISO 9001 certificate
1998 – Merge with capital group Polimex – Cekop
1999 – Obtaining American Quality System Certificate ASME
2004 – Merge of Polimex – Cekop, Mostostal Siedlce and establishing of a new capital group Polimex Mostostal, owning 82% of SEFAKO S.A. shares.