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File:GEC two-rate electricity meter, circuit (Rankin Kennedy, Electrical Installations, Vol II, 1909).jpg - Wikimedia Commons
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GEC two-rate electricity meter (Rankin Kennedy, Electrical Installations, Vol II, 1909 Stock Photo - Alamy
![File:GEC two-rate electricity meter (Rankin Kennedy, Electrical Installations, Vol II, 1909).jpg - Wikimedia Commons File:GEC two-rate electricity meter (Rankin Kennedy, Electrical Installations, Vol II, 1909).jpg - Wikimedia Commons](https://upload.wikimedia.org/wikipedia/commons/1/13/GEC_two-rate_electricity_meter_%28Rankin_Kennedy%2C_Electrical_Installations%2C_Vol_II%2C_1909%29.jpg)
File:GEC two-rate electricity meter (Rankin Kennedy, Electrical Installations, Vol II, 1909).jpg - Wikimedia Commons
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