Here's a list of non-HP RPN units:
| Manufacturer | Owned Models | Other Models |
| Accuron |
600 |
|
| Commodore | MM6X | |
| Corvus | 500 | |
| Elektronika (Russia) | mk-61 | B3-19M, B3-21, B3-24, MK-54 |
| Magiclic |
306 |
|
| MBO |
L-0832 |
|
| Montogomery Ward |
P10 | |
| National Semiconductor |
Model
600 |
900, Mathematician, 4615, 4640 |
| Novus (later name for National Semicondutor) | 4510, 4515, 650 |
3500 SR, 4520, 4525, 6035 |
| Omron | 12SR | |
| Prinztronic |
Programmable Scientific | |
| Privileg (Germany) | SR-54NC | |
| Santron |
12S, 604 | |
| Sanyo |
CZ-2901 |
|
| Sinclair | Scientific | Scientific Programmable |
| RFT (former DDR VEB) |
Konkret 600 (identical to Elektronika B3-19M) |
See also Nigel Tout's Vintage
Calculators Web Museum, the MSDSite
and the The
Spyropoulos
Site.