US PATENT SUBCLASS 446 / 196
.~.~.~.~ Including piston slidable along central apertured member

Current as of: June, 1999
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446 /   HD   AMUSEMENT DEVICES: TOYS

176  DF  OPERATED BY RELATIVELY MOVING FLUID OR PRESSURE DIFFERENTIAL {9}
180  DF  .~ Including variable-size fluid chamber to move fluid {5}
188  DF  .~.~ Sounding {5}
195  DF  .~.~.~ Reciprocating valve {1}
196.~.~.~.~ Including piston slidable along central apertured member

DEFINITION

Classification: 446/196

Including piston slidable along central apertured member:

(under subclass 195) Device wherein the member mounted for to-and-fro movement includes an air moving-surface which is slidably mounted upon an elongated rod or tube of lesser transverse dimension and whose longitudinal axis passes through said surface, wherein an opening provided through the rod or tube is alternately covered and uncovered as the member slides along the rod or tube.