Z:gnu-www-ja-stallman-mec-india--8e393f-Now, this kind of mistake is n/en

Now, this kind of mistake is not in fact that rare. It's not the only one. You see, patent examiners don't have a lot of time to spend on one patent. In the US they have an average of 17 hours per patent. Now that's not enough to carefully study all the other patents in the area to see if they are really the same thing. So they are going to make this kind of mistake over and over.