US PATENT SUBCLASS 92 / 217
.~.~.~ Interconnected by relative rotation of parts

Current as of: June, 1999
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92 /   HD   EXPANSIBLE CHAMBER DEVICES

172  DF  PISTON {19}
208  DF  .~ Open-ended hollow skirt type (e.g., trunk type) {15}
216  DF  .~.~ Plural separable parts {3}
217.~.~.~ Interconnected by relative rotation of parts {1}
218  DF  .~.~.~.~> With means to prevent relative rotation of parts

DEFINITION

Classification: 92/217

(under subclass 216) Apparatus in which the parts are provided with cooperating interengaging portions such that the rotation of one of the parts relative to the other will cause engagement of said interengaging portions to detachably secure the parts together.