I think there were plenty of devices that did both of these things before either of these two devices, they are just ideas, not patented designs. Have you ever heard the saying "imitation is the sincerest form of flattery"? I think that comes in to play pretty heavily here. Even if you are saying they stole the idea, they did a good job improving upon it, they weren't too swelled up in their own pride to look over it and move on to something else.