Help identifying this blade server?

I was able to recently pick up this blade server for free, but cannot find any information on it. The people responsible for managing this server are longer employed there, and no one else there has any information on it.

They are getting rid of a lot of additional equipment, and it looks like I may have missed a part when grabbing this chassis, as each blade has a connector on it that I am not familiar with.

Anything would help - thanks!