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Who contributed what to Multics when, based on source code history comments: lippard.org/Multics/span...

This shows that the only remaining Bell Labs contributions in the source code are three small changes from Joseph F. Ossanna, and I suspect this was true even before I started working for Multics in the 1980s.

I suspect most of their work was before the PL/I compiler was ready, and so was entirely rewritten.