Ministry of Road Transport and Highways
Ministry of Defence
Public Works Department, Government of West Bengal.
Ministry Of Railways
Border Roads Organisation
Civil Aviation
Human & Works settlement, Govt. of Bhutan
All India Radio
MTNL
Border security Force
Pioneer Fabricators Pvt Ltd.
BSTL Pipes Ltd
Alcolite
Milton Industries Ltd
Avery Dennison
Indian Army
Military Engineer Services
National Highway Authority of India.
Central Public Works Department.
IRCON
PWD – Assam
BSNL
Hindustan Petroleum Corporation Ltd.
Siliguri Traffic Police
Department of Roads, Govt. of Nepal