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Traction power system of ac railroads
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Traction power supply system of ac railways
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Automatic device to adjust voltage in overhead contact system and transformer substation
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Contact system
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Three-phase regulated converter of alternating voltage into direct voltage
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Transformer machine for alternating current electric railroads
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Contact network
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Ac transformer set for electrified railways
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Power supply circuit of direct current railway
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Adjustable-voltage ac transformer set for electrified railways
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