How to Read Telephone Circuit Diagrams
David Sherrill Hulfish. Page Lesson XIV 142 Relays a Polarized. Reverse Acting . Vibrating. Lesson XV 151 Relays a A lternating Current. Coherer. Speech Current. Lesson XVI 159 Switchboard Signals. Drops. Mechanical Visual*. Lamps.
| Title | : | How to Read Telephone Circuit Diagrams |
| Author | : | David Sherrill Hulfish |
| Publisher | : | - 1910 |
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