Fragment of a discussion from Milestone-Proposal talk:Bell Telephone Laboratories, Inc., the First 60 Years, 1925-1984
I also concur with Mischa Schwartz's observation. In this case having a multiple plaque presentation is logical. But I also agree that removing redundant text should be considered. Finally, a check if a similar milestone, (like in the case of the transistor,) exists to remove conflicts, may be in order as suggested by Ggcooke.