Western Electric 550B
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| Switchboard ID | 12 |
|---|---|
| Manufacturer | Western Electric |
| Model | 550B |
| Years Manufactured | |
| Switchboard Type | Common Battery |
| Switchboard Application | PBX |
| Last Service Location | Marshall Hotel, Marshall, Minnesota |
| Special History | This board had 2 trunks. Power and ringing were provided on cable pairs from the Northwestern Bell Central Office which was located across the street from the Marshall Hotel. |
| Switchboard Description |