Machines for the beverage industry and machine tools; motors and engines (except for land vehicles); machine coupling and transmission components (except for land vehicles); agricultural implements (not hand operated); incubators for eggs; brewing machinery and mechanical brewing devices, in particular malt and raw fruit silos; machines, mechanical devices and installations thereof for the cleaning of malt and raw fruits; mechanical installations for transporting malt and raw fruits, in particular with a facility for weighing and/or aspiration; rough grinding mills; grain conveyors and grain silo installations; stirring devices for moving liquid media of differing consistencies in containers, in particular of mechanical design with a number of arms and with release and emptying devices or as pump stirring devices; CO2 liquefaction installations; refrigeration compressor, in particular open compressors, semi-hermetically and hermetically sealed compressors, screwed compressors and turbo compressors; condensers, in particular air-cooled condensers, evaporation condensers and water-cooled condensers, also with water recooling devices; oil separators; water and salt stirring devices; filter apparatus for the separation of solids from a liquid, in particular alkaline solutions