US PATENT SUBCLASS 73 / 447
.~.~ With liquid level responsive gauge or compensator

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}
444  DF  .~ Freely vertical reciprocable float with carried indicium {4}
447.~.~ With liquid level responsive gauge or compensator

DEFINITION

Classification: 73/447

(under subclass 444) Devices having liquid level responsive means to indicate liquid level or to adjust the hydrometer reading in accordance with varying liquid level.