D/F® is the registered trademark of D/F Machine Specialties, Inc. D/F Machine Specialties, Inc. is not affiliated with Lincoln Electric®, Miller Welding®, ESAB®, Linde®, Tweco®, Thermal Arc®, Thermadyne® and other "MIG" & "TIG" welding manufacturers. Those manufacturers mentioned are for reference only and are the registered trademarks of their respective companies.