307 / | HD | ELECTRICAL TRANSMISSION OR INTERCONNECTION SYSTEMS |
43 | DF | PLURAL SUPPLY CIRCUITS OR SOURCES {14} |
72 | .~ Diverse or unlike electrical characteristics {3} | |
73 | DF | .~.~> Differing frequencies |
74 | DF | .~.~> Differing capacities |
75 | DF | .~.~> Differing voltages {1} |