(under the class definition) Structure comprising a structure including a rigid elongated member in the form of a shaft or openwork wherein a section thereof is mounted for movement relative to another to lengthen or shorten the structure without collapse or disassembly.
SEE OR SEARCH THIS CLASS, SUBCLASS:
111+, for powered, movable or extensible mast assemblies.
645+, for an openwork having components adjustably or collapsibly connected.
SEE OR SEARCH CLASS
212, Traversing Hoists,
230+, 264, and 267 for extensible boom structure for load-handling apparatus. 248, Supports,
200.1, for a bracket on a extensible column mounted between opposed surfaces; and subclasses 354.1+ for an adjustable length prop or brace for an article.
