INDUSTRIAL GASES; NAMELY, OXYGEN, NITROGEN, CARBON DIOXIDE, HYDROGEN, HELIUM, ARGON, NEON, KRYPTON, XENON, SPECIAL GASES AND MIXTURES THEREOF; CALCIUM CARBIDE; CHEMICAL PREPARATIONS AND SUBSTANCES FOR USE IN THE WELDING, CUTTING, BRAZING, SOLDERING, AND THERMIC TREATMENT OF MATERIALS; CHEMICAL PREPARATIONS AND SUBSTANCES FOR USE IN THE METALLURGICAL INDUSTRY AND IN THE MANUFACTURE OF FOODSTUFFS