US PATENT SUBCLASS 73 / 331
.~.~.~.~ Bull's eye 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  DF  .~.~.~ Transparent closure plate type {1}
331.~.~.~.~ Bull's eye type

DEFINITION

Classification: 73/331

(under subclass 330) Gauges wherein the transparent closure means is in the form of one or more disks commonly called "bull's eyes".