| Serial # Range | Summary of Change / Description | Part # | Doc # | Download Link |
|---|---|---|---|---|
| - CURRENT | GEN C - New housing design, proportional control capability | EF*AAC | 28055 | Download Manual |
| 44500 - 50500 | GEN B - Universal Housing/Boom Design | EFBAAB | 28030 | Download Manual |
| 44000 - 44499 | GEN A - Original Design | EFBAAA | 21820 | Download Manual |
