(under subclass 393) Subject matter having switch stands with special locks acting directly on the switch-rails or on moving parts other than the operating-rod and connected to the switch-stand proper through the switch-rails.
(1) Note. In many cases the lock does not operate and permit the actuating-lever to complete its throw until the switch comes home into position, thereby indicating when, because of an obstruction or from any other cause, the switch is not fully thrown.
SEE OR SEARCH THIS CLASS, SUBCLASS:
15, and 131+, appropriate subclasses for interlocking devices.
