21 Portable Electric Spot Welders, Electric Powered Hot or Cold Air Blowers for Industrial Use in Drying out Electrical Equipment, Such as Electric Motors, Electrical Wiring, etc.; Portable Electric Powered Tank Type Suction Cleaners and Blowers for Industrial Use, Portable Electric Powered Drum Type Conversion Units for Industrial Use in Wet or Dry Vacuum Pick-Up, and Portable Electric Powered Vacuum Type Boiler Tube Cleaners, and Attachments and Parts for All of the Foregoing