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Chamberlain 1/2 HP Smart Chain Drive Garage Door Opener with Battery Backup (4-Pack) C2212TX4 - The Home Depot
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KeylessOption Garage Door Gear and Sprocket Kit for Liftmaster 41C4220A fits Chamberlain, Sears, Craftsman 1/3 and 1/2 HP Chain Drive Models, 2 Pack - Walmart.com
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LiftMaster Elite Series 8365W-267 1/2 HP Chain Drive Garage Door Opener - WI-FI *** Obsolete *** (Part # OGDRLM-8365W267PH)
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LiftMaster 3255 Contractor Series 1/2 HP Chain Drive W/O Rail Assembly - Garage Door Hardware - Amazon.com
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83650-267 | ½ HP AC Chain Drive Wi-Fi® Garage Door Opener with Integrated Bluetooth Technology | LiftMaster
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