23 CENTRAL LUBRICATING EQUIPMENT FOR MACHINERY, VEHICLES AND RAILWAY WHEEL FLANGES, INCLUDING LUBRICANT PUMPS, ASSEMBLIES OF PUMPS WITH MOTORS, OIL RESERVOIRS AND GREASE SUMPS, LUBRICANT DISTRIBUTORS, DOSING AND METERING DEVICES, TUBINGS FILTERS, REGULATING AND CONTROL APPARATUS AND OTHER PARTS, ACCESSORIES AND FITTINGS FOR CENTRALIZED LUBRICATING SYSTEMS