US PATENT SUBCLASS 138 / 43
.~.~.~ Variable restriction

Current as of: June, 1999
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138 /   HD   PIPES AND TUBULAR CONDUITS

37  DF  WITH FLOW REGULATORS AND/OR BAFFLES {3}
40  DF  .~ Restrictors {4}
42  DF  .~.~ Tortuous path {1}
43.~.~.~ Variable restriction

DEFINITION

Classification: 138/43

(under subclass 42) Devices wherein the device is adjustable to vary the restriction.