US PATENT SUBCLASS 137 / 559
.~ Inspection means

Current as of: June, 1999
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137 /   HD   FLUID HANDLING

551  DF  WITH INDICATOR, REGISTER, RECORDER, ALARM OR INSPECTION MEANS {6}
559.~ Inspection means

DEFINITION

Classification: 137/559

(under subclass 551) Apparatus which provides means which permit or facilitate observation or inspection of the fluid inside the apparatus or of normally invisible parts of the apparatus.

SEE OR SEARCH CLASS

73, Measuring and Testing,

323, for sight glasses, per se.

222, Dispensing,

154+, for dispenser combined inspection devices comprising gauge tubes, sight openings, transparent flow line sections or graduated transparent containers.