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| 9A00.00 – SUPPORT SYSTEMS/FACILITY |
| 9A10.00 – Blackboard Tools |
| 9A20.00 – Audio |
| 9A30.00 – Slide Projectors |
| 9A34.00 – Film Projectors |
| 9A36.00 – Overhead Projectors |
| 9A38.00 – Video & Computer Projection |
| 9A40.00 – Photography |
| 9A50.00 – X-Y, Chart Recorders |
| 9A60.00 – Buildings |
| 9A65.00 – Museums |
| 9A70.00 – Resource Books |
| 9A73.00 – Unclassified Demonstrations |
| 9A75.00 – Philosophy |
| 9A80.00 – Films |
| 9A85.00 – Computer Programs |
| 9B00.00 – ELECTRONIC |
| 9B10.00 – Timers |
| 9B15.00 – Position and Velocity Detectors |
| 9B17.00 – Sources of Sound |
| 9B18.00 – Sound Detectors |
| 9B20.00 – Circuits/Components/Instruments |
| 9B30.00 – Function Generators |
| 9B37.00 – Oscilloscopes |
| 9B40.00 – Advanced Instruments |
| 9B50.00 – Power Supplies |
| 9B60.00 – Light Sources |
| 9B61.00 – Light Paths Made Visible |
| 9B62.00 – Lasers |
| 9B65.00 – Microwave Apparatus |
| 9B90.00 – Computer Interface |
| 9C00.00 – MECHANICAL |
| 9C10.00 – Motors |
| 9C20.00 – Pumps |
| 9C25.00 – Vacuum |
| 9C30.00 – Air Support |
| 9C35.00 – Ripple Tank |
| 9C40.00 – Other |