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 TEST & MEASUREMENT (571000) is a Level-3 category.

5-7-0-0-0-0   INSTRUMENT                                         

5-7-1-0-0-0   TEST  &  MEASUREMENT                               

5-7-1-1-0-0   MEASURING INSTRUMENT              

5-7-1-1-1-0   VOLTAGE/CURRENT/RESIS           

5-7-1-1-2-0   MULTIMETERS                           

5-7-1-1-3-0   POWER/ENERGY MEASUREMENT                

5-7-1-1-4-0   PANEL METER                               

5-7-1-1-5-0   FIELD STRENGTH                   

5-7-1-1-6-0   SIGNAL GENERATOR               

5-7-1-1-7-0   COMMUNICATION EQUIPMENT         

5-7-1-1-9-0   OTHER MEASUREMENT

5-7-1-5-0-0   ANALYZER

5-7-1-5-1-0   COMMUNICATION NETWORKS     

5-7-1-5-2-0   WAVEFORM/DISTORTION            

5-7-1-9-0-0   OTHER TEST & MEASUREMENT

5-7-1-9-1-0   CALIBRATION/STANDARDS

5-7-1-9-2-0   PORTABLE INSTRUMENTS

5-7-1-9-9-0   OTHER NEC

5-7-2-0-0-0   AUTOMATIC  TESTER

5-7-2-1-0-0   COMBINATION  ATE

5-7-2-2-0-0   BARE  BOARD/OTHER

5-7-2-3-0-0   LOADED  BOARD

5-7-2-4-0-0   MICROPROCESSOR 

5-7-2-5-0-0   MEMORY

5-7-2-6-0-0   OTHER SEMICONDUCTOR

5-7-3-0-0-0   MEDICAL  INSTRUMENT

5-7-3-1-0-0   DIAGNOSTIC

5-7-3-2-0-0   THERAPEUTIC

5-7-3-2-1-0   THERAPEUTIC

5-7-3-2-9-0   MEDICAL  LASER

5-7-3-3-0-0   OTHER  MEDICAL

5-7-3-3-1-0   PATIENT  MONITOR

5-7-3-3-9-0   HEARING AID

5-7-3-4-0-0   RADIOLOGIC

5-7-3-4-1-0   DIAGNOSTIC/THERAPY

5-7-3-4-2-0   DENTAL  X-RAY

5-7-3-4-3-0   INDUSTRIAL/X-RAY

5-7-3-4-9-0   X-RAY  PARTS/TUBES

5-7-3-9-0-0   OTHER  MED  INSTRUMENTS

5-7-5-0-0-0   ANALYTICAL

5-7-5-1-0-0   CHROMATOGRAPHS

5-7-5-2-0-0   SPECTROPHOTOMETERS

5-7-5-3-0-0   SPECTROMETERS

5-7-5-4-0-0   ELECTROCHEMICAL

5-7-5-5-0-0   AUTO  CHEMICAL  ANALYZER

5-7-5-6-0-0   CLINICAL LAB INSTRUMENT

5-7-5-8-0-0   OTHER  ANALYTICAL  INSTRUMENT

5-7-5-9-0-0   PARTS & ACCESSORIES

5-7-6-0-0-0   NUCLEAR  INSTRUMENTS

5-7-7-0-0-0   LASER & ULTRASONIC

5-7-7-1-0-0   LASER  SYSTEMS & EQUIPMENT

5-7-7-2-0-0   ULTRASONIC

5-7-8-0-0-0   AVIONIC  INSTRUMENTS

5-7-9-0-0-0   OTHER  INSTRUMENT  NEC

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