US PATENT SUBCLASS 73 / 54.18
.~.~.~ With means for restoring an object to its initial starting position (e.g., magnetic or fluid means)

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

53.01  DF  LIQUID ANALYSIS OR ANALYSIS OF THE SUSPENSION OF SOLIDS IN A LIQUID {15}
54.01  DF  .~ Viscosity {11}
54.15  DF  .~.~ Gravity movement of an object in a liquid (e.g., a bubble) {5}
54.18.~.~.~ With means for restoring an object to its initial starting position (e.g., magnetic or fluid means)

DEFINITION

Classification: 73/54.18

With means for restoring an object to its initial starting position (e.g., magnetic or fluid means):

(under subclass 54.15) Subject matter including means for returning the object to its original position after the completion of each test.