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 COMPUTER + MINIMUM MEMORY (541000) is a Level-3 category.

5-4-0-0-0-0 COMPUTER                                           

5-4-1-0-0-0 CPU+MIN MEMORY                                 

SUBTOTAL PC, WORKSTATION & BOARDS                 

5-4-1-1-0-0 PERSONAL COMPUTERS                         

5-4-1-1-1-0 DESKTOP PCS                                       

5-4-1-1-2-0 PORTABLE COMPUTERS                         

5-4-1-1-3-0 NETWORK COMPUTERS                         

5-4-1-1-8-0 PROCESSOR BOARDS                             

5-4-1-2-0-0 BUS/PROF/SCI WORKSTATION               

5-4-1-3-0-0 MINICOMPUTERS $15-$250,000               

5-4-1-4-0-0 MAINFRAMES >$250,000                         

5-4-1-8-0-0 SPECIAL-PURPOSE

5-4-1-8-1-0 DIGITAL

5-4-1-8-2-0 ANALOG & HYBRID

5-4-1-8-8-0 COMPUTER KITS

5-4-1-9-0-0 PARTS & COMPONENTS

5-4-2-0-0-0 STORAGE PRODUCTS

5-4-2-1-0-0 ADD-ON MEMORY

5-4-2-2-0-0 SOLID STATE PERIPHERAL

5-4-2-3-0-0 DISK STORAGE

5-4-2-3-1-0 RIGID DISK DRIVES

5-4-2-3-2-0 FLEXIBLE DISK DRIVES

5-4-2-3-9-0 MAGNETIC STORAGE MEDIA

5-4-2-4-0-0 TAPE DRIVES

5-4-2-5-0-0 MASS/OPTICAL

5-4-2-9-0-0 STORAGE PARTS & COMPONENTS

SUBTOTAL INPUT & OUTPUT DEVICES

5-4-3-0-0-0 INPUT DEVICES

5-4-3-1-0-0 KEY INPUT

5-4-3-2-0-0 NONKEY INPUT & SCANNERS INC. BAR CODE

5-4-3-3-0-0 VOICE & MAGNETIC INK RECOGNITION

5-4-4-0-0-0 OUTPUT DEVICES

5-4-4-1-0-0 PRINTERS

5-4-4-3-0-0 COMPUTER FILM OUTPUT

5-4-4-4-0-0 PLOTTERS

5-4-4-5-0-0 VOICE OUTPUT

5-4-4-6-0-0 PUNCH DEVICES

5-4-4-9-0-0 OTHER/PARTS/COMPONENTS

5-4-5-0-0-0 TERMINALS

5-4-5-1-0-0 TELEPRINTERS

5-4-5-2-0-0 CRT TERMINALS

5-4-5-3-0-0 GRAPHIC TERMINALS

5-4-5-4-0-0 OTHER SPECIAL PURPOSE TERMINALS

5-4-5-6-0-0 ADD-ON DEVICES FOR TERMINALS

5-4-5-9-0-0 OTHER TERMINALS & PARTS

5-4-5-9-1-0 CRT MONITORS

5-4-5-9-2-0 OTHER MONITORS & IN/OUT DEVAL

5-4-5-9-8-0 ACCESSORIES FOR PERIPHERALS

5-4-5-9-9-0 PARTS FOR TERMINALS

5-4-7-0-0-0 COMMUNICATION INTERFACES

5-4-7-1-0-0 MUX/CONC/CONV

5-4-7-2-0-0 MODEMS

5-4-7-3-0-0 OTHER DATA COMM

5-4-7-3-1-0 LOW CAPACITY

5-4-7-3-2-0 HIGH CAPACITY

5-4-7-9-0-0 LAN/OTHER DATA COMM

5-4-9-0-0-0 OTHER COMPUTER EQUIPMENT

5-4-9-7-0-0 OTHER NEC

5-4-9-8-0-0 OTHER CPU & PARTS

5-4-9-9-0-0 PARTS FOR PERIPHERALS

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