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SODA ASH AND BICARBONATE OF SODA, CAUSTIC SODA, TRICHLOROETHYLENE, PERCHLOROETHYLENE, [ HEXACHLOROCYCLOHEXANE (C6H6C16), ] ITS ISOMERS AND VARIOUS FORMULATIONS CONTAINING SAID PRODUCTS, [ CHLORITES, LIQUID CHLORINE, ] POLYVINYL CHLORIDE AND ITS COMPOUNDS, CALCIUM CHLORIDE, SOLID CALCIUM CHLORIDE [ AND CALCIUM HYPOCHLORITE MIXTURES FOR USE IN THE INDUSTRIAL ARTS ]