ONGC
NTPC
IOCL
DRDO
IRCON
Punj Lloyd
Tata Consultancy Services
L&T-ECC
SIMPLEX
Alstom
Patel Engineering
Satyam Computers
Tata Tele Services
Kirloskar Oil
Power Grid
NHPC
HPCL
HLS ASIA
RITES
ABB
VEDANTA
WIPRO
MECON
ACC
HCC
Mahindra & Mahindra
Tata Motors
Nokia Siemens

* These are to name some of the important companies. Not all visiting companies are listed