| ▲ | CamperBob2 6 hours ago | |
Cathodic protection against corrosion was the goal of using -48V, in the telcos' case. | ||
| ▲ | myself248 4 hours ago | parent [-] | |
And the telegraph lines before that. | ||
| ▲ | CamperBob2 6 hours ago | |
Cathodic protection against corrosion was the goal of using -48V, in the telcos' case. | ||
| ▲ | myself248 4 hours ago | parent [-] | |
And the telegraph lines before that. | ||