| # | Name | Location | Applications |
|---|---|---|---|
| 1. | QT-System LLC | 🇺🇸 Fenton, MI, United States | 4 |
| 2. | QTS ENGINEERING, INC. | 🇺🇸 Medway, MA, United States | 1 |
| 3. | QTS HOLDINGS, LLC | 🇺🇸 Westlake Village, CA, United States | 2 |
| 4. | QTS ITALY S.R.L. | 🇮🇹 Caponago (MB), Italy | 1 |
| 5. | QTS S.R.L. | 🇮🇹 Caponage, Italy | 1 |