US PATENT SUBCLASS 73 / 501
.~.~ Surface of revolving liquid body

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

488  DF  SPEED, VELOCITY, OR ACCELERATION {29}
500  DF  .~ Liquid surface is or moves reading means {1}
501.~.~ Surface of revolving liquid body

DEFINITION

Classification: 73/501

(under subclass 500) Apparatus wherein the indicating surface is that of a confined rotatable body of liquid.