IC 011. US 013 021 023 031 034. G & S: Installations for the separation of liquid to gas or liquid to liquid phase mixtures, namely, distillation columns, rectification columns, absorption columns, desorption columns and extraction columns for substance and heat exchange for use in the separation of liquid to gas or liquid to liquid phase mixtures and parts therefor and parts thereof, namely, trays, floors, fillings and structured packings
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