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| Topic | Replies | Views | Activity | |
|---|---|---|---|---|
| Green Goo vs. a Telephone Central Office Crossbar Switch |
|
2 | 260 | 15 January 2023 |
| Debugging an Electromechanical Telephone Crossbar Switch with a Trouble Recorder |
|
1 | 350 | 10 2022 |
| Telephone Switching Living History in Seattle |
|
0 | 392 | 21 2022 |