1960s
Double Sixteen Co.
1973 – 1974
Helmick, William K.
1997
June 24 1960
June 7 1960
American-Marietta Company
February 21 1994
Mehaffey, Scott A.
1982 – 1986
April 20 2017
Phelps, Caleb
2004 – 2012
Hagstrom, John
September 28 1960
Godshalk, Clarence E.
April 2020
The Morton Arboretum
1990s
May 22 2019
Kannegiesser, Hart
August 9 2022