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Amazon.com: MyVolts 9V Power Supply Adaptor Compatible with/Replacement for Casio CTK-601/CTK-631 Keyboard - US Plug : Musical Instruments
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Amazon.com: UpBright 9V AC/DC Adapter Compatible with Casio CTK-601 CTK-120 CTK601 CTK120 Digital Piano Keyboard Electronic Musical Instrument AD-5 AD-5U AD-5UL TC1 TC2 TC3 9VDC 700mA 850mA Power Supply Charger : Musical
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