BELL No. 30, 31, 32, 33 and 34 | |||||||
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Electro-mechanical "Gamewell" bell with a resistance of 20
ohms. The picture shows the mechanism of electro mechanical bell No. 30A. Used on Fire Alarm systems. Bell No. 30A - 6 inch gong (20 ohm). Found in the GPO Rate Book - 1928, 1947 and 1956.
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Last revised: October 30, 2022FM |