US PATENT SUBCLASS 137 / 86
.~.~ With counter-counter balancing pressure feedback

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

82  DF  PRESSURE MODULATING RELAYS OR FOLLOWERS {3}
85  DF  .~ With counter-balancing pressure feedback to the modulating device {1}
86.~.~ With counter-counter balancing pressure feedback

DEFINITION

Classification: 137/86

(under subclass 85) Apparatus in which the modulated pressure is utilized in a second feedback arrangement to counterbalance the counterbalance of the modulating control element.