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 BUSINESS EQUIPMENT (511000) is a Level-3 category.

5-1-0-0-0-0 BUS/RETAIL/EDUCATION

5-1-1-0-0-0 BUSINESS EQUIPMENT

5-1-1-1-0-0 OFFICE EQUIPMENT

5-1-1-1-1-0 WORD PROCESSING

5-1-1-1-2-0 TYPEWRITING & OTHER

5-1-1-1-3-0 DICTATING & PARTS

5-1-1-1-4-0 MICROFILM

5-1-1-2-0-0 CALCULATOR PARTS

5-1-1-2-1-0 CALCULATOR

5-1-1-2-9-0 CALCULATOR & PARTS

5-1-1-3-0-0 PARTS/ATTACHMENTS

5-1-1-4-0-0 COPYING/DUPLICATING

5-1-1-4-1-0 MONOCHROME COPIERS

5-1-1-4-2-0 COLOR COPIERS

5-1-1-5-0-0 MAILROOM

5-1-1-6-0-0 FACSIMILE EQUIPMENT

5-1-1-9-0-0 OTHER BUSINESS/PARTS

5-1-2-0-0-0 RETAIL EQUIPMENT

5-1-2-1-0-0 CASH REGISTERS

5-1-2-2-0-0 ELECTRONIC RETAILING

5-1-2-2-1-0 FUND TRANSFER

5-1-2-2-2-0 POINT OF SALE

5-1-2-2-9-0 OTHER RETAIL

5-1-2-2-9-1 MONEY HANDLING

5-1-2-2-9-2 CHECK HANDLING

5-1-2-2-9-3 TIME RECORDING/STAMPING

5-1-2-2-9-4 TICKET ISSUING

5-1-2-2-9-9 OTHER

5-1-2-3-0-0 ELECTRONIC GAME

5-1-2-3-1-0 CASINO GAME

5-1-2-3-2-0 COIN OPERATED

5-1-2-3-3-0 ARCADE/AMUSEMENT

5-1-2-3-4-0 JUKE BOX

5-1-2-3-9-0 OTHER ELECTRONIC GAME

5-1-2-9-0-0 GAS PUMP METERS

5-1-3-0-0-0 EDUCATION

5-1-3-1-0-0 TEACHING AIDS

5-1-3-2-0-0 TRAINERS/SIMULATORS

5-1-3-9-0-0 OTHER ELECTRONIC TEACHING

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