Extra parts

Exploration Stage: Hidden Row
From: Professor
Description: I went through the lab again, and nothing seems to be missing. On the contrary, there are devices in there that were not there before... I tend to work on several inventions at the same time, but the mechanical hand that I found when I was going through the lab was clearly not made by me. Come here, come here. Let me show you.
Completed: These mechanized hands were undoubtedly made by the finest craftsmen. They use techniques I have never seen before. But the peculiar rhythm of these fingers prevents them from working at all. Perhaps it was placed there by a rival scientist...