US PATENT SUBCLASS 137 / 512.5
.~.~.~ With common biasing means

Current as of: June, 1999
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137 /   HD   FLUID HANDLING

455  DF  LINE CONDITION CHANGE RESPONSIVE VALVES {11}
511  DF  .~ Direct response valves (i.e., check valve type) {14}
512  DF  .~.~ Plural {6}
512.5.~.~.~ With common biasing means

DEFINITION

Classification: 137/512.5

(under subclass 512) Devices in which the valves are urged toward or away from their seats by the same biasing means.