Photo Courtesy of U.S. Senate Photo Studio and Office of Sen. Carl Levin Senate panel chair Levin wants to close "loophole" for tax transfers like Caterpillar's. Related Links: Senate investigations subcommittee report on Caterpillar overseas taxes Sen. Levin's prepared opening statement from April 1 hearing No one can say Sen. Carl Levin has gone after small fry in investigating U.S. companies' overseas tax policies. The Michigan Democrat has held a series of hearings focusing on Apple, Microsoft and Hewlett-Packard and now has turned his attention to heavy-equipment giant Caterpillar Inc.The Senate Homeland Security Committee's permanent subcommittee on investigations, which Levin
Arch dams, classically curved monoliths situated in narrow valleys, are not as common as other types of dams, such as embankment dams and gravity dams. ENR takes a look at some of the biggest arch dams in the world, both completed and under construction.