H. K. Company
No. 12, S. N. Roy Road Sahapur
Kolkata- 700038, West Bengal (India)
Pressure Temperature Control Instrument Company
No. 1/ B, Topsia Road
Kolkata- 700039, West Bengal (India)
Zoom Instruments Mfg. Co.
25/7, Mahendra Nath Sen Lane
Kolkata- 700040, West Bengal (India)
Leonex Technologies Private Limited
Tangra Industrial Estate, Shed No. C/3, 25 & 27, Canal South Road
Kolkata- 700015, West Bengal (India)