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Amazon.com: APC Smart-UPS SC 420VA - UPS - 420 VA - UPS Battery - Lead Acid (SC420I) : Electronics
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APC Smart-UPS 420 - 420 VA, Input 120V, Output 120V, Interface Port DB-9 RS-232 at TigerDirect.com
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APC Smart-UPS SC420
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Amazon.com: APC Smart-UPS SC SC420 420VA 120V UPS System (Not sold in Vermont) : Electronics
APC Smart-UPS 420/620 230 VAC User's Manual
APC Smart-UPS 420 SUVS420I SU420INET 6V 4.5Ah UPS Replacement Battery: BatteryClerk.com UPS
Amazon.com: APC Smart-UPS SC SC420 420VA 120V UPS System (Not sold in Vermont) : Electronics
