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| More topics under "F28 - Heat exchange in general" (176,138) |
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| F28B - Steam or vapour condensers (4,799) | | F28C - Heat-exchange apparatus, not provided for in another subclass, in which the heat-exchange media come into direct contact without chemical interaction (5,468) | | F28D - Heat-exchange apparatus, not provided for in another subclass, in which the heat-exchange media do not come into direct contact; Heat storage plants or apparatus in general (71,383) | | F28F - Details of heat-exchange or heat-transfer apparatus, of general application (87,927) | | F28G - Cleaning of internal or external surfaces of heat-exchange or heat-transfer conduits, e.g. water tubes of boilers (6,561) |
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