As a user of the devices, the MIT
  team developed methods for testing and characterizing components and
  rejecting the components most likely to fail early.  This knowledge
  fed back to the manufacturers to the point where the manufacturers
  started doing their own testing and QA of their components.  According
  to the book, this was the first systematic attempt at characterizing
  these sorts of components (tubes) in any meaningful way. 
I hope no oldtimers from Western Electric read this book. Or the
military. Or RCA. Or Sylvania.
--
Will