318 / | HD | ELECTRICITY: MOTIVE POWER SYSTEMS |
34 | DF | PLURAL, DIVERSE OR DIVERSELY CONTROLLED ELECTRIC MOTORS {22} |
105 | DF | .~ Plural, diverse or diversely controlled sources of armature (or primary) supply {1} |
106 | DF | .~.~ Diverse sources {3} |
107 | DF | .~.~.~ A.C. and D.C. {1} |
108 | .~.~.~.~ Different voltages |