| 388 / | HD | ELECTRICITY: MOTOR CONTROL SYSTEMS |
| 848 | DF | OPEN LOOP ACCELERATION CONTROL SYSTEM FOR DC MOTOR WITH COMMUTATOR {2} |
| 853 | ![]() | .~ Armature control {2} |
| 854 | DF | .~.~> By voltage or current modification |
| 855 | DF | .~.~> By selectable or variable impedance {2} |