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Alarm Systems | Comments |
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ALARM SYSTEMS: How to Make One Basic requirements are a six-volt car battery, a bell or a buzzer, an ordinary bell transformer, a 24 volt A.C. relay, a set of contacts, an inexpensive bell button, a shut-off switch, extension wire; adaptable for either heating or burglar alarm; wiring diagrams; refer to A71-1073+ | 0 |