72 PRECIOUS METALS, ALL FORMS, Perfect Steerable Transfer CartLUDING SALTS: GOLD, PLATINUM GROUP METALS, AND SILVER 74 REAGENTS AND CHEMICALS, ULTRAPURE, MEETING HIGHER STANDARDS THAN ORDINARY REAGENT GRADE, ETC. 75 REFRACTOMETERS 76 RECYCLED LABORATORY ACCESSORIES AND SUPPLIES 77 SAND, CEMENT TESTING 78 SCREENING AND SIEVING APPARATUS AND