Agreed, definately not at the usual suspect repositories. I did, however, find several references to the McMahon Machine Co and/or McMahon Machine & Tool Co through a newspaper search of the Flat River Library Archives. They have digital collections of the Greenville Independant and The Daily Call newspapers going back to the early part of the last century. However, the references were not by any means a goldmine -- just mentionings on the tax rolls to the company in question. All were from the early to mid 1930's (March 1934, June 1933, etc) and very little after that. Makes me think the company wasn't around for long, or they were bought by someone else. Greenville Tool and Die seems to be a big player there.I find zero references to the company name or any other machines with that name out there.
Hi and welcome to the site ,Mr Pete should be on all newbies watch list . I went to vokie for 4 high school years in 1970 - 74 then did apprenticeship for a few more years. But I like to watch him , reminds me of some of our shop teachers. Good ole guy I say.