7 TIRE BUILDING MACHINES FOR PASSENGER CAR TIRES, LIGHT-TRUCK, MEDIUM AND HEAVY TRUCK TIRES AND FOR AGRICULTURAL TIRES; BATCH-OFF RUBBER SLAB COOLING MACHINERY, NAMELY RUBBER SLAB BELT COOLING CONVEYERS; FEEDERS FOR RUBBER MIXERS, EXTRUDERS AND MILLS; MILL BLENDERS; STOCK SLITTERS FOR USE IN SLITTING RUBBER; STRIP COOLERS FOR USE IN COOLING RUBBER STRIPS; ACCESSORIES FOR RUBBER SLAB COOLING MACHINERY AND STRIP COOLERS, NAMELY PLATFORMS FOR THE OPERATOR, APPARATUS CONSISTING OF AN ADJUSTABLE MARKER FOR AUTOMATICALLY STAMPING RUBBER SLABS WITH A PREDETERMINED CODE CORRESPONDING TO THE COMPOSITION OF EACH PARTICULAR SLAB, REDUCED NOISE FANS, COOLING RACK EXTENSIONS AND REPLACEMENT PARTS THEREFOR; MOTORS NOT FOR LAND VEHICLES; MACHINE COUPLINGS, NAMELY CONVEYORS, GEARS, DRIVE CLUTCH PLATES, CHAINS, CARDAN SHAFTS, BELTS FOR MACHINES