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Amazon.com: MaxLLTo 6ft Extra Long AC Power Replacement Adapter for Casio Keyboard CT-610, CT-615, CT-630, CT-636, CT-638, CT-640, CT-650, CT-657, CT-660, CT-656, CT-670, CT-770 : Electronics
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PwrON (6.6 Foot Long Cable) DC 9V AC to DC Adapter For Casio Casiotone CT-630 CT-636 CT-655 Piano Keyboard Power Supply Cord - Walmart.com
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