[TUHS] UNIX In Bell Labs after SVR2

[segaloco via TUHS]

These manuals I am scanning currently demonstrate steady USG UNIX usage within Bell Laboratories for many, many years.  As time went on and commercial UNIX crawled further and further away from Bell Labs-proper, research continued their own journey with V8 and on.  Within the larger Bell Labs ecosystem, was there a particular leaning towards continued SysV use?  Did these later research versions instead retake the hearts and minds of BTL facilities?  Was it more of a free for all, with research, USG, BSD, etc. sprinkled throughout the various parts of Bell Labs?  Most stuff I read from the mid 70s to mid 80s paints a very USG-centric picture, but I find myself curious on folks' recollections of the situation through the mid 80s and beyond, if any census or rough estimate of UNIX stream uptake in BTL exists.

- Matt G.