What I can say is that the PRS-650 can display at least 2 different font-families in one ePub (I haven't tried more than 2 so far).
I didn't realize the comment on the pdf about the limitation to 1 family-font per epub. Notice that the document is referring to PRS-300/600/900, so my guess is that probably Sony implemented the capability of handling more than one font in the PRS-x50 series, since my PRS-650 can do it. Unfortunately it may imply that also the 505 suffers the limitation of the previous models.
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