McKenna Process Company
Plant formerly located in Joliet, Illinois - ca. 1920.
Specimen cross sections of typical splice bars

Specimen splice bars from the McKenna Process Company
Notes by George, III: These splice-bar sections were saved from George Langford, Sr.'s effects by George, Jr. and passed along to me.   I cannot find any matches in the images in George, Sr.'s picture-books, nor in any of my references; about 5 inches across the maximum diagonal.