Stock-watering fountains and troughs comprising a barometric fountain so related to the trough as to afford a constant supply of water to said trough at a fixed level.
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73,
SEE OR SEARCH CLASS
126, Stoves and Furnaces,
380, for heating vessels having liquid supply means.
137, Fluid Handling,
453+, for barometric level maintaining systems in general.
222, Dispensing, 353, 437, 457, 479, and especially subclasses 585+ for barometric inkwells.
