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Electric bells (2)

Electric Bells and All About Them : A Practical Book for Practical Men [electronic resource] / Selimo Romeo Bottone

How to Install Electric Bells, Annunciators, and Alarms. : Including Batteries, Wires and Wiring, Circuits, Pushes, Bells, Burglar Alarms, High and Low Water Alarms, Fire Alarms, Thermostats, Annunciators, and the Location and Remedying of Troubles [electronic resource] / Norman H. Schneider