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Amazon.com: SEYAS 500W Auto Step Up & Step Down Voltage Transformer Converter, 110-120 to 220-240 Volts, Soft Start & Full Load, 7x24hrs Continous Run, Circuit Breaker Protection, U.S. Patent No. US9225259 B2 :
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Amazon.com: YaeCCC ST-5000 Step Up Step Down Transformer 110V to 220V Step Up Voltage Converter Transformer : Electronics
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