File:Rotary balancing boosters (Rankin Kennedy, Electrical Installations, Vol II, 1909).jpg
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![File:Rotary balancing boosters (Rankin Kennedy, Electrical Installations, Vol II, 1909).jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/b/be/Rotary_balancing_boosters_%28Rankin_Kennedy%2C_Electrical_Installations%2C_Vol_II%2C_1909%29.jpg/800px-Rotary_balancing_boosters_%28Rankin_Kennedy%2C_Electrical_Installations%2C_Vol_II%2C_1909%29.jpg?20100702145649)
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