Someone asked me if there's other tools. Like a Starclaw or an EarthHammer or PlanetHammer. There's not. But I also took that to mean if there are other devices like the Mallet. And there are. I believe I've mentioned it before but there are quite a few devices like it. It's not even the only one to have made it to Earth. 

That's actually something that will come up later in this book.