7 [Hydraulic Power Plants-Namely, Water Turbines, Centrifugal and Piston Pumps, Pump-Turbines, and Governors for Hydraulic Power Plants; Steam Turbines and Gas Turbines, and Governors Therefor; Turbo-Compressors; Wood Debarking Machines; Machines for Batchwise or Continuous Wood Digesting; Machines for the Pulp, Semichemical Pulp, Paper and Board Industries-Namely, Pulpers, Refiners, Hollanders, Stock Cleaners for Separation of Impurities and Contaminants from Materials, Degassing Machines for Eliminating Gases from Materials, Chest Propellors, Agitators, and Dewatering Machines; Papermaking Machines, Board Manufacturing Machines; Machines for Finishing Paper, Board and Plastic Foil; Compressors for Cryogenic Machines; Mechanical, Pneumatic, Hydraulic and Electric Hoists and Ropeways; Hydraulic Presses; Machines for Manufacturing Asbestos Cement Shapes; Vacuum Pumps; Belt Driers for Drying Materials by Gaseous Medium; Industrial Centrifuges; Thickening Machines-Namely, Sedimentation Containers for Separation of Water from Suspensions Having Low Solid Content; Distributing and Dosing Machines Containing Sluice Chambers; Bow Thrusters for Ships in the Nature of a Motor or Propulsion Unit; Machine Housings; Impellers-Namely, for Fluid-Flow Machines, Comprising Rotating Blade and Bucket Arrangements, and Pistons and Crankshafts for Machines]