R-series

"Hmmm... An R series. No, no, not for a long time..."

- Gha Nachkt to Anakin Skywalker, on whether the former had an R2 unit in stock

The R-series was a series of astromech droids manufactured by Industrial Automaton. R2 series astromech droids, such as R2-D2, were part of the R-series.

There were five types of R units:
 * R1
 * R2
 * R3
 * R4
 * R5