Considering you most likely have already looked
at the data file, you may have noticed a major
change in the TSUSA code pattern. The abbreviation
TSUSA stands for "Tariff Schedule of the United
States Annotated." We use this pre-1989 term
synonymously to also include the current "Harmonized
Tariff Schedule of the United States Annotated" (HTSUSA)
used for imported products and the "Schedule
B" used for exports.
Hopefully, you also noticed the hierarchical NAME pattern.
Although not the legal description it certainly
eases data retrieval when selecting by the groupings,
e.g. Groundfish, Tuna, Shrimp, etc. which have
numerous codes associated with the products.