12 CEMENT, JOINT CEMENT, AGGREGATES, GRIT, ANTI-SKID GRIT, ASBESTOS FILLER, FLOOR TOPPINGS AND HARDENERS AND BINDERS THEREFOR, SKIDPROOFING PREPARATIONS CONTAINING ABRASIVE GRIT FOR PROVIDING AN ANTI-SKID SURFACE FOR INDUSTRIAL AISLES, RAMPS, STAIRS, PLATFORMS, AND OTHER FLOOR SURFACES, AND BINDERS AND HARDENERS FOR SUCH SKIDPROOFING PREPARATIONS, GAUGING LIQUIDS USED IN THE REPAIR OF ERODED CEMENT BY ADDITION OF FRESH CEMENT, PATCHING MATERIALS IN THE FORM OF POURABLE CEMENT FOR ANCHORING AND PATCHING CEMENT FLOORS AND OTHER CEMENT SURFACES, PATCHING PRIMERS, CAULKING MATERIALS, ROOFING FELTS AND MEMBRANES, AND SEALING PREPARATIONS FOR MANHOLE COVERS, MASONRY, AND CONCRETE