US PATENT SUBCLASS 73 / 329
.~.~.~ Duplex or multiple section

Current as of: June, 1999
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73 /   HD   MEASURING AND TESTING

290 R  DF  LIQUID LEVEL OR DEPTH GAUGE {13}
323  DF  .~ Sight glass {5}
328  DF  .~.~ Boiler type {3}
329.~.~.~ Duplex or multiple section

DEFINITION

Classification: 73/329

(under subclass 328) Gauges comprising a plurality of transparent portions connected either seriatim for use in determining levels at different ranges, or in multiple so that they may be selectively employed to indicate over the same range.