- Larsen & Toubro Limited
- Gannon Dunkerly & Co. Limited
- Simplex Infrastructures Limited
- Bengal DCL Housing Development Co. Ltd.
- National Building Construction Corporation Limited.
- Petron Civil Engineering Private Limited
- Siemens Limited
- Mcnally Bharat Engineering Co. Ltd.
- ITC Limited
- NCC Limited
- Calcutta Metropolitan Group Ltd.
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