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 | .~.~ Diverse sources {3} | |
107 | DF | .~.~.~> A.C. and D.C. {1} |
109 | DF | .~.~.~> Different voltages |
110 | DF | .~.~.~> Different frequencies |