Foundation Excavation

ID: 1510 ~ Source: Minnesota Historical Society

This file appears in: Cornerstones & Time Capsules

3M breaks ground on Building 21.

This file appears in: Cornerstones & Time Capsules

Cornerstones & Time Capsules

By Marjorie Pearson, Summit Envirosolutions, Inc.

Setting the Cornerstone, Building 21 President William L. McKnight, accompanied by chief engineer E. M. Johnson, supervised the installation of the cornerstone in October 1939. The mason worked for the William Murphy and Son Construction Company.…