(under subclass 679) Subject matter where the machine is a crane.
SEE OR SEARCH THIS CLASS, SUBCLASS:
668, for cable tension in cranes.
SEE OR SEARCH CLASS
212, Traversing Hoists,
276+, for automatic stop control for cranes, and other condition sensors which regulates an indicator, alarm, or controller. Class 212 takes condition responsive indicator systems claimed in combination with any structural details of a crane.