7 OIL PRODUCTION EQUIPMENT, NAMELY, SUBMERGIBLE PUMPS, EXPANDIBLE PARTS (PISTONS, RODS, LINERS, PACKING, VALVES AND SEATS) FOR RECIPROCATING PUMPS; CENTRIFUGAL PUMPS, BUTTERFLY AND CHECK VALVES FOR OIL FIELD AND INDUSTRIAL FLUID HANDLING, PNEUMATIC PERCUSSION TOOLS FOR DRILLING OIL, GAS AND WATER WELLS