[Class : 7] Mechanical Gas Generators For Air Gases, In Particular For Oxygen And Nitrogen; Compressor Units For Air Separators, In Particular Air Compressors For Large Volumes; Mechanical Apparatus For Releasing Compressed Gas Or Compressed Air, Expansion Turbines Supplying Electricity For Compressed Gas Or Liquid Petroleum Gas; Gas Liquefying And Gas Separating Apparatus, In Particular Apparatus For The Liquefaction Of Air Via Pressure And Relaxation Processes, Where Appropriate, Combined With Separation Units Or Columns For Fractionation; Individual Components Of This Apparatus, Namely Cold Boxes, Pressure Control Components, Expanders And Flash Vessels.[Class : 11] Heat Exchangers, Other Than Parts Of Machines And Distillation Columns.