US PATENT SUBCLASS 73 / 330
.~.~.~ Transparent closure plate type

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}
330.~.~.~ Transparent closure plate type {1}
331  DF  .~.~.~.~> Bull's eye type

DEFINITION

Classification: 73/330

(under subclass 328) Boiler gauges wherein the transparent portion is in the form of at least one closure mounted over an aperture in the tubular conduit.

SEE OR SEARCH THIS CLASS, SUBCLASS:

334, for similar closures mounted directly upon the reservoir wall.

SEE OR SEARCH CLASS

220, Receptacles,

377+, 602 and 662+ see the notes thereto, for structures wherein a transparent panel is mounted in a wall.