Heh, I've got its little brother here; the 5-channel 9145A.
Thank you. Interesting design with silver (?) bars. Copper lugs to equalize temperature, while silver pad to provide low resistance contact? 
Yes, those contacts are silver. But I've always wondered about the design, especially concerning the "low resistance" part.
Those silver bars are almost 10mm long, but the bars on the plungers are round, so the actual contact area is only a few 10ths of a mm.