| Nombre | Empresa matriz | Fuente |
|---|---|---|
| Keeler Ltd | Halma Plc | LAANSM |
| Volk Optical Inc | Halma Plc | USFDA |
| Keeler Ltd. | Halma Plc | BAM |
| Medicel AG | Halma Plc | BAM |
| Keeler | Halma Plc | SMPA |
| Medicel Ag | Halma Plc | USFDA |
| Keeler | Halma Plc | MHRA |
| Medicel AG | Halma Plc | VNSAWH |
| Medicel AG | Halma Plc | SATP |
| VOLK OPTICAL INC. | Halma Plc | HC |
| Keeler Instruments Inc | Halma Plc | USFDA |
| Keeler | Halma Plc | HPRA |
| Keeler Opthalmic Instruments | Halma Plc | HPRA |
| Medicel AG | Halma Plc | DMA |
| Keeler Ltd | Halma Plc | RLMPH |