361 / | HD | ELECTRICITY: ELECTRICAL SYSTEMS AND DEVICES |
139 | DF | CONTROL CIRCUITS FOR ELECTROMAGNETIC DEVICES {7} |
160 | DF | .~ For relays or solenoids {11} |
195 | DF | .~.~ Time delay {3} |
196 | .~.~.~ Including semiconductor device connected to timing element {1} | |
197 | DF | .~.~.~.~> Threshold device (e.g., zener, schockley diode) {1} |