Oil & Natural Gas Corporation Ltd (ONGC)
Oil India Ltd (OIL)
Directorate General of Hydrocarbons India (DGH)
Indian Oil Corporation Ltd (IOCL)
Hindustan Petroleum Corporation Ltd (HPCL)
Bharat Petroleum Corporation Ltd (BPCL)
GAIL (India) Ltd
Cairn India Ltd
Gujarat State Petroleum Corporation Ltd (GSPC)
BG Exploration & Production India Ltd (BGEPIL)
Reliance Industries Ltd (RIL)
National Fertilizer Ltd (NFL)
Indian Farmers Fertiliser Cooperative (IFFCO)
Brahmaputra Valley Fertilizer Corporation Limited (BVFCL)
Gujarat Narmada Valley Fertilisers & Chemicals Limited (GNFC)
Engineers India Ltd (EIL)
Projects & Development India Ltd (PDIL)
Tractebel India
Mecon Ltd
L&T Hydrocarbons
Punj Lloyd
SAIL India Ltd
NALCO
Email : sales@billmarketing.com