US PATENT SUBCLASS 73 / 54.21
.~.~.~ Including an object concentricity guide 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}
54.21.~.~.~ Including an object concentricity guide means

DEFINITION

Classification: 73/54.21

Including an object concentricity guide means:

(under subclass 54.15) Subject matter including means for maintaining a constant gap between the container for the liquid and the falling object.