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.
This type of crane consists of a pivoting head and boom assembly, which carries a hoist and trolley unit. The pivoting head is supported either by a floor-mounted mast providing 360Â°-boom rotation or by an existing building column, which provides 180Â° of boom rotation.