US PATENT SUBCLASS 137 / 85
.~ With counter-balancing pressure feedback to the modulating device

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

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

DEFINITION

Classification: 137/85

(under subclass 82) Apparatus in which the modulated pressure is utilized in a feedback arrangement to counterbalance the modulating control element.