35 PACKINGS MADE OF VARIOUS MATERIALS-NAMELY, [ LEATHER, ] METAL, FIBROUS MATERIALS, GRANULAR MATERIALS, RUBBER COMPOUNDS, SYNTHETIC RUBBER COMPOUNDS, PLASTICS AND VARIOUS COMBINATIONS THEREOF; EXPANSION JOINTS; SEALING DEVICES-NAMELY, OIL AND GREASE SEALS, MECHANICAL SEALS AND ACCESSORY PARTS THEREOF; GASKETS AND GASKET MATERIALS, INCLUDING GASKET JACKETS AND ENVELOPES; [ INSULATING TAPES, ] TUBING; SHEETING; PUMP CUPS, [ PISTONS, ] VALVES AND DISCS; PISTON RINGS [ ; AND FLEXIBLE RUBBER PIPE ]