I recently purchased an Air Products (not Airco) single phase MIG welder via the internet. The welder hasn't arrived yet, hopefully by the end of next week, and the only information I can get so far on it is that the letters RCHM are printed on the front and that it comes with a SP-9 spool gun. I assume the spool gun is for aluminum welding. I would like to know who made these welders for Air Products and where I could obtain a manual on the welder and information on the spool gun. Any help is greatly appreciated.