Quote Originally Posted by Bob Seijasicon View Post
Line Material Company, Birmingham, Alabama. My personal theory is that the R stands for Rifle. Their contract was initially for Carbine barrels but was changed to M1icon Rifle before any were made. I theorize that their code would have been LMC but became LMR after the contract was changed. It is pure speculation on my part. They were absorbed into the Power Systems Division of McGraw Edison.
Line Materials also had a plant in Zanesville, OH ( home of the Y bridge ). It was a McGraw Edison transformer plant when I visited it in the late '70s.