FLevel 1

MECHANICAL ENGINEERING

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F01ENGINES OR PUMPS

F02COMBUSTION ENGINES

F03MACHINES OR ENGINES FOR LIQUIDS

F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS

F05INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES

F15ENGINEERING IN GENERAL

F16ENGINEERING ELEMENTS AND UNITS

F17STORING OR DISTRIBUTING GASES OR LIQUIDS

F22STEAM GENERATION

F23COMBUSTION APPARATUS

F25REFRIGERATION OR COOLING

F28HEAT EXCHANGE IN GENERAL

F99SUBJECT MATTER NOT OTHERWISE PROVIDED FOR IN THIS SECTION

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