US PATENT SUBCLASS 92 / 108
.~ Axially extending hollow stem on working member

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

107  DF  ANNULAR WORKING MEMBER OR ANNULAR LINEARLY EXTENDING CHAMBER THEREFOR {1}
108.~ Axially extending hollow stem on working member

DEFINITION

Classification: 92/108

(under subclass 107) Apparatus in which the ring shaped working member is provided with an elongated portion extending in a direction parallel to the longitudinal axis of the ring, said portion being hollow and the dimension of the outer peripheral portion thereof being less than the dimension of the outer peripheral portion of the working member end face.