I don't mean they "invented" those (there were tablets / mp3 players / app stores, etc before). I mean they made them _matter_ (as in, going from nearly bankrupt to largest company on earth matter).
Meanwhile all of their rivals did, absolutely squat. At best, they introduced me-too products in the same space (myriads of iPod "killers", iPad like tablets, app stores, etc).
Maybe Amazon is an exception, they did introduce the Kindle, which is a category of its own, and it got its own copycats (Barnes and Noble, etc). Still, rather small compared.