National Security Service
124, Shree Aurobinda Sarani Hatibagan Junction
Kolkata- 700006, West Bengal (India)
Interglobe Facility Services
No. 54, Asutosh Mukherjee Road
Kolkata- 700020, West Bengal (India)
Vaishali Security Investigation (P) Limited
16, Ganesh Chandra Avenue, Gandhi House, 5th Floor
Kolkata- 700013, West Bengal (India)
Aritra Computers
No. 164/C/50, Lake Gardens
Kolkata- 700045, West Bengal (India)
Anamika Security Services
56 Ground Floor, B B Chatterjee Road, Kasba,Kasba Post Office
Kolkata- 700042, West Bengal (India)