US PATENT SUBCLASS 73 / 280
.~.~.~ With oiling structure

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

861  DF  VOLUME OR RATE OF FLOW {23}
272 R  DF  .~ Element {7}
279  DF  .~.~ Diaphragm {1}
280.~.~.~ With oiling structure

DEFINITION

Classification: 73/280

(under subclass 279) Devices having means for oiling the meter diaphragms to preserve and render them impermeable to avoid inaccuracies caused by porosity of the diaphragm walls.