In 2007, PKF initiated the upgrading of our lattice boom crawler cranes with the purchase of a Terrex Self-Erecting 275-ton HC-275 hydraulically operated lattice boom crane. This crane is tier-three compliant, includes three drums, over 100 feet of boom, and multiple heads. PKF has also recently purchased Terrex 2008 HC-110  110-ton and 2007 HC-165 165-ton lattice boom hydraulically driven crawler cranes.