The design of the Cleveland-Toledo underground telephone cable project
It uses a small current of about 5 mils at metallic 34 volts in order to avoid interference with the telephone circuit with which it is ... of l2 telegraph circuits, operating in a band of frequencies within the voice range, over one four-wire cable circuit.
| Title | : | The design of the Cleveland-Toledo underground telephone cable project |
| Author | : | Ralph Norton Greenman, John Eliseus Noran |
| Publisher | : | - 1937 |
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