Singhania & Sons (P) Ltd.
No. 3- D, Duckback House No. 41, Shakespeare Sarani
Kolkata- 700017, West Bengal (India)
Global Adsorbents Private Limited
No. 216, A. J. C. Bose Road
Kolkata- 700017, West Bengal (India)
Vishnu Corporation
No. 28/2, Shakespeare Sarani, Room No. 301-A, Center Point Building
Kolkata- 700017, West Bengal (India)