| Model Num | Machine S/N Base | Machine S/N First | Machine S/N Last |
|---|---|---|---|
| 631E, 631E II | 1NB | 686 | 871 |
| Misc: | |||
| 631E, 631E II | 3ND | 318 | 536 |
| Misc: | |||
| 631E, 631E II | 1AB | 1446 | 1639 |
| Misc: Use with 9T6538 Head | |||
| 631E, 631E II | 1NB | 872 | 1389 |
| Misc: Use with 9T6538 Head | |||
| 637E, 637E II | 1FB | 368 | 563 |
| Misc: | |||
| 637E, 637E II | 1JB | 666 | UP |
| Misc: | |||
| 631E, 631E II | 1AB | 1076 | 1445 |
| Misc: | |||