(under the class definition) Device including coupling means particularly adapted to allow a plurality of fire escapes, ladders, or scaffolds to be superimposed.
SEE OR SEARCH THIS CLASS, SUBCLASS:
207, for an extension ladder comprised of relatively movable lapped ladder sections.
SEE OR SEARCH CLASS
52, Static Structures (e.g., Buildings),
637+, for superimposed three-dimensional, openwork units (e.g., towers of stacked skeletonal units).
