US PATENT SUBCLASS 138 / 45
.~.~.~ 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}
44  DF  .~.~ Central path {1}
45.~.~.~ Variable restriction

DEFINITION

Classification: 138/45

(under subclass 44) Devices wherein the restrictor is adjustable to vary the restriction.

SEE OR SEARCH CLASS

95, Photography,

64, for camera diaphragms.

239, Fluid Sprinkling, Spraying, and Diffusing,

408+, and 451+ for spray nozzles having adjustable

restrictions.