Telephones and Telegraphs: 1902
This arose in a natural and simple manner from the fact that telephone subscribers in many small towns would call ... The auxiliary circuit has a special battery, and is not connected electrically with the regular circuits of the fire alarm system.
| Title | : | Telephones and Telegraphs: 1902 |
| Author | : | United States. Bureau of the Census, William Mott Steuart, Thomas Commerford Martin, Arthur Vaughan Abbott, William Mayer (Jr.) |
| Publisher | : | - 1906 |
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