US PATENT SUBCLASS 73 / 445
.~.~ Continuous test fluid supply

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}
445.~.~ Continuous test fluid supply

DEFINITION

Classification: 73/445

(under subclass 444) Devices wherein provision is made for the continuous supply or circulation of test fluid to the float unit.