[Class : 7] Actuators For Valves; Air Switching Valves Being Parts Of Machines; Apparatus (Machines) For Filtering; Apparatus (Machines) For Filtering Gases; Apparatus For Compressing Natural Gas; Apparatus For Filling Gas In Bottles; Apparatus For Filling Gas In Containers; Apparatus For The Compression Of Gas; Fluid Pressure Flow Control Valves; Gas Operated Apparatus For ...