Recommendations:

• SIEMENS - Spain, Albania, Azerbaijan, Algeria
• Balcan Electric - 1, 2, 3, 4, 5
• ELIA Plc - for Sofia subway > enlarge
• Energo-Pro - enlarge
• ABB - 1 2
• Extrapack Ltd - enlarge
• GRANITOID - enlarge
• Neochim AD - enlarge

Certificates:

• ISO 9001:2008 > enlarge
• PIRELLI > enlarge
• ABB > 1 2
• ALSTOM > 1
• SCHNEIDER > enlarge
• AREVA > 1 2
• ALCATEL > enlarge

Licence:

• Designer's Certificates > 1 2 3 4 5