Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus (if the apparatus aspects are predominant, see the relevant subclasses for such apparatus, e.g. H02K7/18); Power stations or aggregates (incorporating only machines or engines of positive-displacement type F03C; hydraulic engineering aspects E02B; )

Child Classifications

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• F03B 13/02 Adaptations for drilling wells
• F03B 13/04 Adaptations for use in dentistry
• F03B 13/06 Stations or aggregates of water-storage type, (turbines characterised by having means for functioning alternatively as pumps F03B3/10)
• F03B 13/08 Machine or engine aggregates in dams or the like; Conduits therefor
• F03B 13/10 Submerged units incorporating electric generators or motors
• F03B 13/12 characterised by using wave or tide energy