Pharma Tech International
30, Chaulpatty Road, P. O. Beleghata
Kolkata- 700010, West Bengal (India)
Enn Aar Engineering
No. 427, Pashupati Bhattacharjee Road
Kolkata- 700041, West Bengal (India)
Hindustan Dorr Oliver Limited
No. 3- A, Hindustan Road, Gariahat
Kolkata- 700029, West Bengal (India)
National Engineering Industries
No. 2/2, Sashi Bhusan Basak Lane
Kolkata- 700036, West Bengal (India)