US PATENT SUBCLASS 222 / 402.2
.~.~.~ Pressure lock trap chamber


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222 /   HD   DISPENSING

251  DF  WITH DISCHARGE ASSISTANT (E.G., IMPELLER, PUMP, CONVEYER, MOVABLE TRAP CHAMBER, ETC.) {30}
394  DF  .~ Fluid pressure {9}
402.1  DF  .~.~ Valve actuated by nozzle or through valve outlet {13}
402.2.~.~.~ Pressure lock trap chamber