I see from the tools that the company was known as the K. Miller Tool Co. out of, and as the K. Miller T&M Company ("Tool and Machine"?) out of Springfield, Massachusetts.
The patent on the second tool was granted in 1957 to K.T. Miller of Longmeadow, Massachusetts, just south of Springfield.
I can't find any information on the history of the company, although it now seems to be part of Ripley Tools out of Cromwell, Connecticut.