In Bangladesh: 

Engr. M Rafiqul Islam
Managing Director
Address: 1103/A (2nd Floor), Road No: 1/A
(Ring Road) Adabor, Dhaka–12079 Bangladesh.
Mobile: +88 01711527014
E-mail: rafiq@crescentbd.com
info@crescentbd.com

USA Office:

Build Tech Concepts LLC
8829 N Westland
Dr. Gaithersburg
MD 20877, USA
Cell Number : 240 432 6152
Fax: 301 527 1127
Email: salimhos@varizon.net