[rotorwrench]

The R2600 used a different version of the same carb. There were a lot of different versions of the PD12 series pressure carbs. The Douglas A20G Havoc used the R2600s.

Bendix went on to design & manufacture the continuous flow fuel injection systems that are still in use on smaller aircraft engines today. They still have a throttle body and pressure regulator with automatic mixture control but they feed fuel through stainless steel lines to the fuel injectors in the intake ports. RSA-5 and RSA-10 are the most common. Precision Airmotive Corporation in now the manufacturer of them.