GDP Revised Up in Second Quarter Wednesday, September 29, 2004 WASHINGTON — A slowdown in U.S. economic growth during the second quarter of the year was not as sharp as previously thought, the Commerce Department (search) reported on Wednesday, partly because businesses built up inventories at the strongest rate in four years. U.S. gross domestic product (search) — the measure of total output within the nation's borders — expanded at a revised 3.3 percent annual rate in the April-June second quarter. That was up from a 2.8 percent rate the government estimated a month ago but still the slowest rate...