1991
- Commencement of activity in the field of power electronics and power industry.
1997
- Commencement of activity in the field of tram line catenary networks.
1999
- Extension of power services by the construction of cable grids, transformer stations, street lighting.
2000
- Commencement of delivery of projects in the field of maintenance of tram line infrastructure.
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2002
- Acquisition of PREFTOR S.A., specialising in the construction and modernisation of tram tracks - gaining of competence for comprehensive project delivery.
- Acquisition and delivery of comprehensive projects throughout Poland in terms of tram line infrastructure.
2006
- Extension of activity in the field of railway catenary and powering
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2009/2010
- Acquisition of Przedsiębiorstwo Robót Komunikacyjnych w Krakowie S.A., specialising in the construction and modernisation of railway tracks - gaining of competence for comprehensive project delivery.
2010 - 2011
- Integration process of operations of ZUE and PRK.
- Acquisition and delivery of comprehensive projects in the field of railway infrastructure.
- Public offer
- The implementation of an integrated information system Microsoft Dynamics AX 2009 in ZUE and PRK
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