US PATENT SUBCLASS 418 / 153
.~ Resilient

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

152  DF  NON-METALLIC WORKING MEMBER, CYLINDER OR PARTITION {1}
153.~ Resilient {1}
154  DF  .~.~> Partition integral with working member {1}

DEFINITION

Classification: 418/153

(under subclass 152) Apparatus in which the nonmetallic material is a deformable elastic material.