US PATENT SUBCLASS 418 / 220
HELICAL WORKING MEMBER

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

220HELICAL WORKING MEMBER

DEFINITION

Classification: 418/220

(under the class definition) Apparatus in which the working member is provided with a continuous circumferential working portion in the form of a helix extending from one end to the other end thereof.