D

MACHINE PARTS, NAMELY SILENCERS NOT FOR LAND VEHICLES; MUFFLERS FOR INTERNAL COMBUSTION ENGINES; SILENCERS FOR GAS TURBINE ENGINES; SPARK ARRESTORS FOR ENGINES; FILTERS BEING PARTS OF MACHINES; FILTERS FOR CLEANING AIR FOR ENGINES; CENTRIFUGAL PRE-CLEANERS AND AIR CLEANERS FOR ENGINES; DUST UNLOADER VALVES FOR CENTRIFUGAL AIR CLEANERS; COOLANT CLARIFYING UNITS FOR GRINDING MACHINES; CENTRIFUGAL SEPARATORS FOR REMOVING PARTICLES FROM LIQUIDS IN CONTINUOUS FLOW; POROUS MEDIA AIR FILTERS AND PRE-SCREENERS FOR ENGINES; OIL BATH AIR CLEANERS FOR INTERNAL COMBUSTION ENGINES; AIR-OIL SEPARATORS HAVING A COALESCING ELEMENT FOLLOWED BY AN INERTIAL SEPARATOR; AIR INTAKE CAPS AND HOODS FOR AIR FILTERS FOR ENGINES; AIRCRAFT GYRO FILTERS; DUST COLLECTORS AND DUST SEPARATORS OF AN INDUSTRIAL NATURE FOR USE IN MANUFACTURING PROCESSES

[ GAUGES FOR MONITORING AND INDICATING AIR FLOW RESTRICTION ]

AIR FILTERS (NOT FOR SCIENTIFIC PURPOSES AND NOT BEING PARTS OF ENGINES, OF MOTORS OR OF MACHINES); OIL FILTERS (NOT BEING PARTS OF LUBRICATION SYSTEMS OF INTERNAL COMBUSTION ENGINES); VENTILATION PANEL FILTERS FOR INDUSTRIAL VENTILATION; AUTOMATIC SELF-CLEANING DUST FILTERS FOR INDUSTRIAL APPLICATIONS; VENTILATING AND FILTERING INSTALLATIONS TO SUPPLY FILTERED CLEAN AIR TO ENCLOSED ROOMS; AIR FILTERING INSTALLATIONS FOR BUILDINGS AND FACTORIES PRIMARILY COMPRISING SELF-CLEANING FILTER CARTRIDGE COLLECTORS; AND VENTILATION PANEL FILTERS FOR VEHICLES OPERATOR CABS, FOR AIR CONDITIONERS AND FOR ELECTRONIC EQUIPMENT

[ MUFFLERS, SILENCERS AND SPARK ARRESTORS FOR LAND VEHICLES; AND AIR FILTERS FOR FIXED WING AIRPLANES AND HELICOPTERS ]