You don't create cars that drive on wheels or float, or even drive at all. Your cars are able to spin their way to any destination, at blazing speeds.
What about a gun? Well, this gun doesn't even shoot. Instead, it calls upon a strike of lightning! Regardless, your 'specialization' is utterly absurd. Your inventions do completely ridiculous things instead of what they're meant to do.
A tank that uses its barrel to fly into the air? Why not. A sword that can spin, the rotational force causing it to fire 9mm parabellum? Sure. How about a generator that reduces power instead? Okay. It's all there.