US PATENT SUBCLASS 137 / 512.3
.~.~.~ Diverse types

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}
512.3.~.~.~ Diverse types

DEFINITION

Classification: 137/512.3

(under subclass 512) Devices in which the valves are of different types, e.g., disc valves and ball valves, or are of different size so that they operate at different pressures.