(under subclass 685) Apparatus comprising means for varying the distance between said carrier and the pivot of a vertically swingable member on which the carrier is mounted.
SEE OR SEARCH CLASS
52, Static Structures (e.g.,., Buildings),
118, for a telescopic vertically swinging elongated shaft, per se.
212, Traversing Hoists,
230+, 264, and 348+ for extensible booms claimed in combination with or having structure (e.g.,., cable passage or chaffing strip) peculiar to a crane.
