Business has been lively and growing at the 828 International Trading Company in the six years since John Shepherd and his partner began selling area rugs imported from a half-dozen countries around the globe. But now a large batch of colorful cotton rugs that they recently had shipped from China has been ensnared by a Bush administration measure imposed in May to punish Chinese companies accused of supplying ballistic missile technology to Iran. Unwittingly, 828 International Trading, based in Greenville, S.C., is just one of an unknown number — and variety — of American businesses that have been tripped up by the measure, which banned all shipments by five Chinese concerns to the United States for two years to penalize them for violating the Iran Nonproliferation Act of 2000. Full Story