Molded Packing with Groove and Corresponding Projection Composed of [ Asbestos or ] Cotton Duck, with a Rubber or Composition Binder, With or Without Metal Strips of an Anti-Frictional Composition Made in Various Sizes and Lengths Spiraled or Coiled; Also Cut or Molded Rings, for Use in Packing Rods and Stuffing Boxes of Engines or Pumps for Service in Steam, Water, Oil, Gasoline, Acids, and Air