| S480 SEATING SYSTEM (K933860) | Fortress Scientific , Ltd. | 1994-03-28 |
| A921 12 VOLT POWER SOCKET (K933856) | Fortress Scientific , Ltd. | 1994-03-28 |
| 730 POWER BASE (K933858) | Fortress Scientific , Ltd. | 1994-03-28 |
| SC930 SEAT CONTROLLER (K933859) | Fortress Scientific , Ltd. | 1994-03-28 |
| FORTRESS C-500 MICROPROCESSOR CONTROLLER (K930088) | Fortress Scientific , Ltd. | 1994-03-28 |
| FORTRESS C-300 MICROPROCESSOR CONTROLLER (K932597) | Fortress Scientific , Ltd. | 1994-03-28 |
| S490 SEATING SYSTEM (K933855) | Fortress Scientific , Ltd. | 1994-03-28 |
| 770 POWER BASE (K933854) | Fortress Scientific , Ltd. | 1994-03-28 |
| S500 SEATING SYSTEM (K933863) | Fortress Scientific , Ltd. | 1994-03-28 |
| S860 SEATING SYSTEM (K933861) | Fortress Scientific , Ltd. | 1994-03-28 |
| A901 TILT IN SPACE (K933853) | Fortress Scientific , Ltd. | 1994-03-28 |
| 720 POWER BASE (K933864) | Fortress Scientific , Ltd. | 1994-03-28 |
| FORTRESS 1704FS FOUR WHEEL SCOOTER (K922966) | Fortress Scientific , Ltd. | 1992-08-03 |
| FORTRESS 1700FS REAR WHEEL DRIVE SCOOTER (K922967) | Fortress Scientific , Ltd. | 1992-08-03 |
| FORTRESS 760-N 4 WHEEL POWER WHEELCHAIR (K921070) | Fortress Scientific , Ltd. | 1992-05-26 |
| FORTRESS 1800FS REAR WHEEL DRIVE SCOOTER (K921069) | Fortress Scientific , Ltd. | 1992-04-29 |
| FORTRESS BUDDY FRONT WHEEL DRIVE SCOOTER (K900042) | Fortress Scientific , Ltd. | 1990-01-12 |
| FORTRESS VICTORY POWER WHEELCHAIR (K900039) | Fortress Scientific , Ltd. | 1990-01-12 |
| FORTRESS 760FS POWER WHEELCHAIR (K900038) | Fortress Scientific , Ltd. | 1990-01-12 |
| FORTRESS LIBERATOR RWD SCOOTER (K900041) | Fortress Scientific , Ltd. | 1990-01-12 |
| FORTRESS 755FS PEDIATRIC WHEELCHAIR (K900037) | Fortress Scientific , Ltd. | 1990-01-12 |
| FORTRESS SPIRIT POWER WHEELCHAIR (K900040) | Fortress Scientific , Ltd. | 1990-01-12 |
| FORTRESS 1000FS ADD-ON POWER UNIT (K895596) | Fortress Scientific , Ltd. | 1989-10-23 |
| FORTRESS MODEL 2001LX ELECTRIC 3-WHEELER (K895692) | Fortress Scientific , Ltd. | 1989-10-16 |
| FORTRESS 2000FS 3-WHEEL SCOOTER (K895693) | Fortress Scientific , Ltd. | 1989-10-05 |
| FORTRESS 655FS POWER WHEELCHAIR (K895595) | Fortress Scientific , Ltd. | 1989-10-05 |
| FORTRESS MODEL 2200FS FRONT WHEEL DRIVE SCOOTER (K895694) | Fortress Scientific , Ltd. | 1989-10-03 |