(under subclass 451) Devices having means for controlling the supply by boiler pressure. This subclass also contains patents having claims to boiler structure combined with the feeding mechanism.
SEE OR SEARCH THIS CLASS, SUBCLASS:
448.1, and 449, for the combination of the feed water and the fuel controlling devices depending on boiler pressure.
SEE OR SEARCH CLASS
417, Pumps,
279+, for pumps having condition responsive control of the pumped fluid.
