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| Shelf 5 |
620.11 - 621.31 |
| 621 |
Mechanical Engineering |
| 621.3 |
Electrical Engineering |
| 621.3185 |
Digital Electronics |
| 621.3192 |
Electrical Circuits |
| 621.31924 |
Electrical Installation |
| 621.31924 |
Wiring |
| 621.381 |
Electronic Engineering |
| Shelf 6 |
621.31 - 624.06 |
| 621.31924 |
Electrical Installation |
| 621.31924 |
Wiring |
| 621.381 |
Electronic Engineering |
| 621.3815 |
Electronic Circuits |
| 621.382 |
Communications Engineering |
| 621.56 |
Refrigeration & Air Conditioning |
| 621.9023 |
Computer Numerical Control (CNC) |
| 621.988 |
Three dimensional printing |
| 622 |
Mining and Related Operations |
| 623 |
Military and Nautical Engineering |
| 624 |
Civil Engineering |
