Not the historian here, but here's what I know: The owner of EFM passed away last year and either it was sold or consolidated with a company that was known as Thermo Dynamics located on Rt 61 in Schuylkill Haven. Hope that helps for now.
Now for a funny story. In 1976, I was searching for a job as I had just dropped out of Embry Riddle Aeronautical University when I learned I wasn't able to get behind the yoke until the Spring semester because the school had over suscribed students. As a impatient young lad my future as a pilot was in disarray. Thank God I left because the job market for pilots hit rock bottom as Vietnam pilots were prime choice so I would have been in debt like a current college grad with no prospects for a job.
I applied for a welder trainee job at Thermo Dynamics, got called for the interview, was handed a ark welder for a test and just like the guy in the Allstate commericial I had no clue what to do with the stick. In fact, it was the first time I ever had a helmut on and I might as well have welded the guy giving me the test for all that I could see out of the shield.
I ended up getting my pilots license and did much better under the instrument training hood however. Never touched a ark welder since and I don't ever intend to!