72126492
Aug 22, 1961
Mar 26, 1963
Heating, Lighting, and Ventilating Apparatus-Namely, Tube Evaporators, Falling Film Evaporators, Tube and Shell Vapor Condensers, Baffle Plate Solvent Extractors Embodying Heat Exchangers, Coil-Type Heat Exchangers, Shell and Tube Heat Exchangers, Distillation Towers, and Solvent Extraction Columns
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