SKM Geotech
No. 30- A, Canal East Road
Kolkata- 700011, West Bengal (India)
Mercury Enterprises
No. 38, Ground Floor, Strand Road, G. P. O.
Kolkata- 700001, West Bengal (India)
British Indian Engineering Stores
No. 11, BBD Bag East
Kolkata- 700001, West Bengal (India)
Scientific Miscellany Co.
No. 11, Pasupati Bose Lane
Kolkata- 700003, West Bengal (India)
Surya Instruments
28, Tara Chand Dutta Street, Ground Floor
Kolkata- 700073, West Bengal (India)
Electrical Measuring Instruments
No. 12/1, Suren Sarkar Road Beliaghata
Kolkata- 700010, West Bengal (India)
Oriental Company
40/ 3, L. N. C. Lane Kadamtala, West
Howrah- 711101, West Bengal (India)