Cornerstone Time Capsule


This file appears in: Placas de inscripción y cápsulas de tiempo
Cornerstone Time Capsule

The Building 42 cornerstone contained a time capsule holding samples of 3M products, the 1949 company annual report, a copy of Megaphone magazine, a history of the company, newspaper accounts of the attempted assassination of President Harry S. Truman several days earlier, and an aerial photo of the Saint Paul Plant.


This file appears in: Placas de inscripción y cápsulas de tiempo