- CPWD
- NDMC
- PWD-Delhi
- Indian Railways
- Hindustan Pretab Ltd
- DLF Projects
- Larsen & Toubro
- Apollo Pharmacy
- Panacea Biotec
- Adani Power Ltd.
- Gammon India Ltd.
- Gactel Turnkey Projects Ltd.
- Supreme Industries Ltd.
- Gallant Metal Ltd.
originally found here;- http://www.ndtindia.org/accrediations.html#acc