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Amazon.com: 9V AC/DC Adapter Charger Cord for Casio CTK-411 CTK 411 Keyboard Replacement Power Supply Adaptor : Musical Instruments
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HQRP AC Adapter / Power Supply for Casio CTK-401 / CTK401 / CTK-411 / CTK411 Keyboards Replacement - Walmart.com
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Vintage Casio CTK-411 Keyboard Synth, Works but Has Quirks So Sold As Is! Great For Circuit Bending! | Reverb
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