Central Government :
· All India Radio (CCW)
· Telecom Department
· Eastern Railway
· Metro Railway
· Eastern Coalfields Limited
· Southern Eastern Railway
· Geological Survey Of India
· C.P.W.D., Patna

State Governments :
· PWD (West Bengal)
· Zila Parishad (W.B.)
· West Bengal State Electricity Board

Government Undertakings :
· Indian Oil Corporation Ltd.
· Bridge & Roof Company (I) Limited
· BHEL
· Bihar Rajjya Pool Nirman Nigam Ltd.
· Ircon Internatiional Limited
· H.S.C.L.
· W.B.H.B
· Chandan Nagar Municipality
· Uranium Corporation India Ltd.
· Uttar Pradesh Rajkiya Nirman Nigam Ltd.

Foreign Companies :
· Sumitomo Electric, Japan
· Antea, Cedex, France
· Agro Development, Gargenville, France