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.
A crawler crane is a type of mobile crane available with either a telescopic or lattice boom that moves upon crawler tracks. As a self-propelled crane, it is able to move around a site and perform jobs without much set-up.