US PATENT SUBCLASS 92 / 218
.~.~.~.~ With means to prevent 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  DF  .~.~.~ Interconnected by relative rotation of parts {1}
218.~.~.~.~ With means to prevent relative rotation of parts

DEFINITION

Classification: 92/218

(under subclass 217) Apparatus including a separate element interengaging between the relatively rotatable piston parts, said element when in operative interengaging position being effective to prevent relative rotation between the parts.