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Electric bells : a handbook to guide the practical worker in installing, operating, and testing bell circuits, burglar alarms, thermostats and other apparatus used with electric bells the instructions for building the instruments will appeal to the experimenter
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Catalogue of telegraph instruments and supplies : Morse telegraph instruments, voltaic batteries, insulated wires, line wire and tools, insulators, cables, office supplies, permanent magnets, induction coils, american district telegraph apparatus, electric bells, &c., &c
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