History of Computing at Bell Labs (1997)
research.swtch.com
research.swtch.com
Sounds like the RPC-4000 in the famous "Story of Mel:" http://www.catb.org/jargon/html/story-of-mel.html
A paper covering the earlier period is A History of Computing Research at Bell Laboratories (1937-1975): http://cm.bell-labs.com/cm/cs/cstr/99.pdf
relevant article : http://www.nytimes.com/2012/02/26/opinion/sunday/innovation-...