US PATENT SUBCLASS 356 / 249
.~.~ Liquid surface (e.g., bubble level)

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

247  DF  FIDUCIAL INSTRUMENTS {3}
248  DF  .~ Artificial reference {2}
249.~.~ Liquid surface (e.g., bubble level)

DEFINITION

Classification: 356/249

(under subclass 248) Subject matter where the artificial reference is determined by the surface of a fluid.