The database is arranged as a hierarchy. For example, the value of a Level-3 equipment category is equal to the sum of its Level-4 subcategories.  A category's level can be determined by the number of non-zero digits.  For example ENTERTAINMENT ELECTRONICS (531000) is a Level-3 category.

5-3-0-0-0-0 CONSUMER & AUTOMOTIVE ELECTRONICS

5-3-1-0-0-0 ENTERTAINMENT ELECTRONICS

5-3-1-1-0-0 RADIO

5-3-1-2-0-0 TELEVISION

5-3-1-2-1-0 COLOR TV

5-3-1-2-2-0 B & W TV

5-3-1-2-5-0 PROJECTION TV

5-3-1-2-6-0 HIGH DEFINITION TV

5-3-1-3-0-0 AUDIO EQUIPMENT

5-3-1-3-1-0 PHONOGRAPH

5-3-1-3-2-0 MAGNETIC TAPE REC.

5-3-1-3-3-0 AMPLIFIERS

5-3-1-3-9-0 OTHER AUDIO

5-3-1-4-0-0 MUSICAL INSTRUMENTS

5-3-1-4-1-0 ELECTRONIC ORGAN

5-3-1-4-2-0 GUITAR/AMPLIFIER

5-3-1-5-0-0 VIDEO PLAYER/RECORDER

5-3-1-5-1-0 TAPE PLAYER/RECORDER

5-3-1-5-2-0 DISC PLAYER

5-3-1-6-0-0 ELECTRONIC GAMES

5-3-1-9-0-0 MISCELLANEOUS

5-3-1-9-1-0 KITS

5-3-1-9-9-0 OTHER ENTERTAINMENT

5-3-2-0-0-0 HOME ELECTRONICS

5-3-2-1-0-0 GARAGE DOOR OPENERS

5-3-2-2-0-0 OTHER HOME ELECTRONICS

5-3-3-0-0-0 PERSONAL ELECTRONICS

5-3-5-0-0-0 AUTO ELECTRONICS

5-3-5-1-0-0 ENTERTAINMENT

5-3-5-2-0-0 PERFORMANCE

5-3-5-3-0-0 SAFETY/SECURITY

5-3-5-4-0-0 INSTRUMENT/INFO

5-3-5-5-0-0 COMFORT/CONVENIENCE

5-3-5-6-0-0 COMM/NAV & OTHER

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