| # | Name | Location | Applications |
|---|---|---|---|
| 1. | RK Mechanical, Inc. | 🇺🇸 Denver, CO, United States | 1 |
| 2. | RKM | 🇫🇷 Ermenonville, France | 1 |
| 3. | RKM IP Holding LLC | 🇺🇸 Dover, DE, United States | 2 |
| 4. | RKM Rotationskolbenmaschinen | 🇩🇪 Berlin, Germany | 1 |
| 5. | RKM-Rotationskolbenmaschinen GBR | 🇩🇪 Berlin, Germany | 1 |
| 6. | RKMAG CORPORATION | 🇺🇸 Middletown, DE, United States | 2 |