1 gases and gas mixtures, gases and gas mixtures in liquid or dissolved form, and high purity gases and gas mixtures, all for use in general industry, scientific research, and photography; gases and gas mixtures, namely, oxygen, hydrogen, nitrogen, liquid nitrogen, carbon dioxide, liquid helium, nitrogen monoxide, ammonia, ozone, ethylene and mixtures thereof, for agricultural, horticultural, and forestry use; gases for laboratories; test gases and test gas mixtures for use in scientific research and industrial processes; oxygen, carbon dioxide, nitrogen, argon, hydrogen, helium in single gas or gas mixtures, all for scientific research purposes