US PATENT SUBCLASS 73 / 334
.~.~ 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}
334.~.~ Transparent closure plate type

DEFINITION

Classification: 73/334

(under subclass 323) Glasses mounted directly over an opening in the wall of a container or reservoir.

SEE OR SEARCH THIS CLASS, SUBCLASS:

330, for similar transparent closure plates mounted over apertures in tubes.

427+, for graduated measuring vessels.

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.