i think the each of 7 dwarf lords held the rings, and with the rings power they led the 7 dwarf - hosts. somewhere around.
there is traces in the appendixes though... about the one sauron takes back from this dude in dol guldur... when he goes to visit the necromancer. cant remember clearly though.
eventually; at the end of the 3rd age sauron had them, or they where melted by dragons. i thonk he had 3 or 4.
we will need someone with a little better perspective than me here, though
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