(under subclass 218) Subject matter having electrically-actuated circuit closing and breaking devices especially adapted for use in controlling circuits actuating railway switches and signals and not of general application.
SEE OR SEARCH CLASS
335, Electricity: Magnetically Operated Switches, Magnets, and Electromagnets, appropriate subclasses, for relay structure;
160+, for interlocked electromagnetic relays; and subclasses 5 and 50 for other types of interlocked electric circuit makers and breakers. See also, appropriate subclasses for electromagnetically operated switches of general application.
