US PATENT SUBCLASS 33 / 728
.~.~.~.~ With lock means

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}
728.~.~.~.~ With lock means

DEFINITION

Classification: 33/728

With lock means:

(under subclass 722) Subject matter having means to secure an indicator so that it cannot be removed by normal operation.