McKenna Process Company
Plant formerly located in Joliet, Illinois - ca. 1920.
Image 6 - Inspected & Graded Rails - Marked - Three Each A-B-C for
Comparison with US Pat. No. 1,212,364 by George Langford, Sr.
Image 6 - Ispected and Graded Rails - marked A/B/C compare to George Langford US Pat No. 1,212,364
 Image 6 - Inspected and Graded Rails - comparison to George Langford, US Pat No. 1,212,364
 Image 6 - Inspected and Graded Rails - George Langford US Pat No. 1,212,364 - column 2