| # | Name | Location | Applications |
|---|---|---|---|
| 1. | DUIKER COMBUSTION ENGINEERS B.V. | 🇳🇱 Wateringen, Netherlands | 1 |
| 2. | Duiloe Mgmt. Limited Liability Company | 🇺🇸 Wilmington, DE, United States | 1 |
| 3. | DUIN DIGITECH CO., LTD. | 🇰🇷 Seoul, South Korea | 1 |
| 4. | DUINMAAIJER B.V. | 🇳🇱 Weesp, Netherlands | 1 |