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I googled it and came up with nothing. My thought though is ihe 40 is the approx screen size and the Dr420 may be related to the pict size like 480i or 1060... Either way im figuring the 40Dr510 is most likely the NEWEST made of this model. Id call geek squad and ask. Tbh.. if youalready bought the tv.. i wouldnt even worry abt it.
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