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STATIONARY AND PORTABLE TESTING SCREENS FOR SIZING TEST SAMPLES OF CRUSHED STONE, SAND AND GRAVEL, SLAG, CORAL AND COKE, ORES AND SIMILAR MATERIALS, SAMPLE SPLITTERS FOR PREPARING SAMPLES FOR TEST-SIZING, AND ACCESSORIES AND PARTS THEREOF- NAMELY, SCREEN TRAYS, TRAY RACKS, SAND ATTACHMENTS, DOOR ENCLOSURES, HYDRAULIC AND MECHANICAL CLAMPS, WIRE BRUSHES, CARRYING CASES FOR SCREENS COVERS AND COVER HOLDERS, AND MATERIAL PANS; STATIONARY AND PORTABLE SAMPLERS FOR THE DIVIDING OF AGGREGATES, ORES, AND SIMILAR MATERIALS FOR PURPOSES OF SUBSEQUENT SAMPLE ANALYSIS AND/OR PHYSICAL TESTING; ULTRASONIC VIBRATING SIEVE SHAKER; ELECTRONIC UNITS FOR GATHERING WEIGHT DATA FROM SIEVING OPERATIONS AND COMPUTER PROGRAMS FOR ANALYZING, PLOTTING AND MARKING DECISIONS CONCERNING SAID DATA