ETC (EXPORT TRADING COMPANY) is a private company that usually purchases items from domestic manufacturers, then sells them to foreign markets. The difference between an EMC and an ETC is sometimes insignificant, i.e., an EMC may occasionally take title of goods, while an ETC may sometimes work strictly on commission without purchasing the goods. The difference is what the company normally does.
UST is United States Treasury.
BATCH is a collection of things or persons to be handled or processed together.
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