This article is from the DVD Formats FAQ, by jtfrog@usa.net (Jim Taylor) with numerous contributions by others.
No. Standard DVD players will not play laserdiscs, and you can't play a DVD
disc on any standard laserdisc player. (Laserdisc uses analog video, DVD
uses digital video; they are very different formats.)
However, Pioneer produces combo players that play laserdiscs and DVDs (and
also CDVs and audio CDs). Denon and Samsung are rumored to have LD/DVD
players in the works also.
 
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