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 most recognizable part of any crane is the boom. This is the steel arm of the crane that holds the load. Rising up from just behind the operator's cab, the boom is the essential piece of a crane, allowing the machine to raise loads to heights of several dozen feet.Mouseover the parts of the hydraulic crane for descriptions.Most hydraulic truck cranes have a boom that has several telescoping sections. For instance, a 70-ton Link-Belt hydraulic truck crane has a boom with three telescoping sections. This particular boom has a length of 127 feet (38.7 meters).his is the steel arm of the crane that holds the load. Rising up from just behind the operator's cab, the boom is the essential piece of a crane, allowing the machine to raise loads to heights of several dozen feet. Mouseover the parts of the hydraulic crane for descriptions.