Adaptations of machines or engines for special use

Official title: 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; {combinations with wind energy converters F03D9/008})

F03B13/00 (Adaptations of machines or engines for special use) appears on 3,372 US grants and 3,834 published applications in this corpus.