- Larsen & Toubro Ltd.
- Enron Oil & Gas (I) Ltd.
- Cairn Energy India Pty. Ltd.
- Thermax Babcock & Wilcox Ltd.
- GACL
- Raina Engineers
- Pfizer Ltd.
- American Consulate
- Elecon Engg. Co. Ltd. Vallabh Vidyanagar Gujarat
- ION Exchange (I) Ltd. Mumbai
- Engineering Systems Ltd., Bangalore
- Hindustan Dorr-Oliver Ltd., Mumbai
- Udyogika Pvt. Ltd., Faridabad
- Reliance Constructions Pvt. Ltd., Mumbai
- Space Age Engineering & Projects Pvt. Ltd. Pune
- Diamines & Chemicals Limited
- Ebasco Overseas Corpn., New York
- Gannon Dunkerley & Co. Ltd., Bombay
- C. Schniewindt West Germany
- United Construction Baroda, Gujarat
- Essar Projects Ltd
- Onaway Engg. Pvt. Ltd., Bombay
- National Buildings Construction Corpn. Ltd
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