On a trip to NYC I got to tour the WTC while Swift CEC was doing a mod..Machine rooms control either A Base or B Base, and if memory serves me correctly one of the early GF closed loop controls.. I actually got a print around here somewhere..It was very, very, cool...

Largest I maintaned was a 75 story, B Base, 140 selector, 1400 FPM...

It Don't mean a thing if it aint got that swing.

Cool, Free, Johnny Smith courtesy of NPR..HERE
http://www.npr.org/ramfiles/asc/asc25.smith.asx