| # | Name | Location | Applications |
|---|---|---|---|
| 1. | PRF Composite Holdings Limited | 🇬🇧 Dorset, United Kingdom | 1 |
| 2. | PRFC, Inc. | 🇺🇸 Reno, NV, United States | 1 |
| 3. | PRÜFTECHNIK AG | 🇩🇪 Ismaning, Germany | 1 |
| 4. | PRÜFTECHNIK DIETER BUSCH AG | 🇩🇪 Ismaning, Germany | 7 |
| 5. | PRÜFTECHNIK DIETER BUSCH AG | 🇩🇪 Oskar-Messter-Strasse, Ismaning, Germany | 1 |
| 6. | PRÜFTECHNIK DIETER BUSCH GMBH | 🇩🇪 Ismaning, Germany | 2 |