US PATENT SUBCLASS 73 / 440
.~ Multiple floats of graduated density

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

32 R  DF  SPECIFIC GRAVITY OR DENSITY OF LIQUID OR SOLID {7}
440.~ Multiple floats of graduated density

DEFINITION

Classification: 73/440

(under subclass 32) Devices involving a plurality of floats of different densities for seriatim response.