| Frame | Model type | Establish year | Name |
|---|---|---|---|
| Model 481 | |||
| 101 | RD50 481 | 1974 | RD50 |
| RD50J 481 | - | RD50J | |
| 100101 | RD50 481 | 1975 | RD50 |
| 200101 | RD50-2 481 | 1977 | RD50Ⅱ |
| Model 2U2 | |||
| 101 | RD50 2U2 | 1978 | RD50 |
| 20101 | RD50SP 2W1 | 1978 | RD50SP |
| 40101 | RD50 2U2 | 1978 | RD50 |
| 300101 | RD50 4M9 | 1980 | |