[Class : 7] Machines And Apparatus For Liquefying Gases, In Particular Gas Mixtures Containing Methane, In Particular Natural Gas; Compressors For Compressing Gases Or Refrigerants; Turbines For Decompressing Gases Or Refrigerants; Valves [Parts Of Motors And Engines] For Decompressing Gases Or Refrigerants; Companders [Machines With Compression And Decompression Stages] For Compressing And Decompressing Gases Or Refrigerants; Installations For Liquefying Gases Comprising Combinations Of The Aforesaid Machines And Apparatus; Natural Gas Liquefying Apparatus And Machines And Components Thereof (As Far As Included In This Class); Industrial Machines For Chemical And/Or Physical Treatment Of Methane Containing Gas Mixtures, In Particular Of Natural Gas, Comprising Combinations Of The Aforesaid Machines And Apparatus.