US PATENT SUBCLASS 33 / 727
.~.~.~.~ With filter or vent

Current as of: June, 1999
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33 /   HD   GEOMETRICAL INSTRUMENTS

700  DF  DISTANCE MEASURING {13}
713  DF  .~ Sounding type {6}
721  DF  .~.~ For nongaseous material {1}
722  DF  .~.~.~ Liquid (e.g. dipstick) {7}
727.~.~.~.~ With filter or vent

DEFINITION

Classification: 33/727

With filter or vent:

(under subclass 722) Subject matter having means to prevent impurities from entering the fluid or onto an indicator, or means to permit passage or escape of gas from the fluid.