Antagonistic pairs of muscles are muscle where one move the bone in one direction and the other moves it back the other way in transmission of nerve impulses to the muscles.
Demag, which manufactures and distributes telescopic and lattice boom cranes, is one of the leading mobile crane producers worldwide, with 2001 revenues of approximately $360 million.
The jib crane boom is fabricated out of a steel I-beam or a wide flange beam and has removable end stops. A machined lower roller carriage is housed in the jib crane head section that features heavy steel side plates.The lower roller carriage is mounted on adjustable tension bolts to allow for field adjustments.his jib crane, nicknamed âSuper Jibâ, is a full cantilevered model with a 60-foot span and a capacity of 7 1/2 tons. The jib is mounted onto an existing outdoor gantry crane at a nuclear power plant in California.