Years ago electric retracts were common. Hal Debolts was one of the earliest designs. Later Ralph Andrae ( orig Wing Mfg )designed and built electric retracts. I still have some and they are not by any stretch of the imagination foolproof. Kraft radios also built some electric retracts that were bulky and rather touchy to operate. They had a seperate box for control that plugged into the Kraft rcvr.

Just my opinion but I believe the air operated ones are still the best .