| # | Name | Location | Applications |
|---|---|---|---|
| 1. | H. Lotterman Beheer B.V. | 🇳🇱 Ruinen, Netherlands | 1 |
| 2. | HL OPERATING CORP. | 🇺🇸 LEBANON, TN, United States | 2 |
| 3. | HL OPTICS CO., LTD. | 🇰🇷 Hwaseong-si, South Korea | 2 |
| 4. | HLOPTICS CO., LTD. | 🇰🇷 Hwaseong-si Gyeonggi-do, South Korea | 1 |