Annular steam tubes, i.e. the steam being heated between concentric tubes with

Official title: {Annular steam tubes, i.e. the steam being heated between concentric tubes with the heating fluid flowing in inner and around outer tube}

F22G3/005 (Annular steam tubes, i.e. the steam being heated between concentric tubes with) appears on 5 US grants and 7 published applications in this corpus.