Castro Engineering Pvt. Ltd.
W Road, Shanpur(Shibtala) , Dasnagar
Howrah- 711105, West Bengal (India)
Unique Instruments Corporation
No. 41, B. B. Ganguly Street, Near Central Metro Station
Kolkata- 700012, West Bengal (India)
United National Scientific Co.
No. 16/1- B, Prankrishan Mukharjee Road, Near Tala Post Office
Kolkata- 700002, West Bengal (India)
J. K. Enterprise
Shyampur, B. B. T Road
Kolkata- 700137, West Bengal (India)