33990 - Primary metal products (Miscellaneous)
33991 - Metal powders, Paste & Flakes
3399111 - - Metal powders: Aluminum & Aluminum-base alloy (Aluminum content only)
3399133 - - Metal powders: Copper & Copper-base alloy (Copper content only)
3399155 - - Metal powders: Iron & Steel (Iron content only)
3399166 - - Metal powders: Nickel-cobalt base superalloy materials
3399177 - - Metal powders: Tungsten & Tungsten based alloys
3399186 - - Metal powders: Molybdenum
3399187 - - Metal powders: Titanium
3399188 - - Metal powders: Tantalum
3399191 - - Primary precious metal & Precious-metal-base alloy powders, Paste & Flakes (Gold, Silver, Platinum, etc.)
3399198 - - Other Primary nonferrous powders, Paste & Flakes
3399199 - - Metal powders, Paste & Flakes (Miscellaneous)
339919A - - Nonferrous powders, Paste & Flakes (+ Precious metals) Other
33992 - Primary metal products (General)
3399211 - - Nonferrous nails, Brads, Tacks & Staples
3399298 - - Primary metal products (General)
3399299 - - Primary metal products (Miscellaneous)
3399XX0 - - Primary metal products (Miscellaneous - Volume)
3399XX2 - - Primary metal products (Miscellaneous - Speciality)