23 MATERIAL HANDLING EQUIPMENT-NAMELY, TRACTOR MOUNTED AND WHEELED LAND SCRAPERS, GRADER BLADES, TRACTOR AND DOZER SHOVELS, DOZER BLADES, TRACTOR LOADERS, RIPPERS, LAND-CLEARING RAKES, CABLE AND HYDRAULIC CONTROLLED POWER UNITS FOR OPERATING AND ADJUSTING SAID MATERIAL HANDLING EQUIPMENT AND STRUCTURAL PARTS THEREOF