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Older Kindles don't have an external navigation facility. The ncx is used for the progress bar and for jumping from chapter to chapter (or wherever the ncx entries are pointing to). Even in that instance, older Kindles only read the top level of the ncx.
Amazon based the Kindles on Mobipocket's software which it bought way back when. Mobipocket used the <guide> entries in the opf for a menu but even there Kindles would only recognize a few types of entries.
So Kindle users have had to rely on the internal html contents page until the newer devices showed up.
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