B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
B66C1/00—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles
B66C1/10—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles by mechanical means
B66C1/12—Slings comprising chains, wires, ropes, or bands; Nets
A HOLLOW SECTION, OF LIGHT WEIGHT AND HIGH FORTRESS, FOR MULTI-SECTION TELESCOPIC BOOMS OR BOOMS AND A TELESCOPIC CRANE BOOM OR BOOM THAT INCORPORATES SUCH HOLLOW SECTION