 |
|
circuit switching : 61 phrases in 13 subjects |
| Automated equipment | 11 |
| Aviation | 1 |
| Communications | 4 |
| Computers | 3 |
| Earth sciences | 3 |
| Electrical engineering | 1 |
| Electronics | 23 |
| General | 1 |
| Hobbies and pastimes | 1 |
| Information technology | 10 |
| Patents | 1 |
| Telecommunications | 1 |
| Telegraphy | 1 |