Machine shop: general machining; arc, gas, MIG & TIG welding; surface grinding, drilling, boring, cutting, honing, lathe & mill work Gaseous fuels and additives, Fuel additives, Gaseous fuels, Boring machines, Grinding machines, Molding machines, Cutting machines, Sanding machines, Polishing machines, Turning machines, Sawing machines, Milling machines, Planing machines