US PATENT SUBCLASS 418 / 77
.~ Grooved working member surface

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

75  DF  GROOVED ABUTTING CYLINDER-ROTATING MEMBER END SURFACES {7}
77.~ Grooved working member surface

DEFINITION

Classification: 418/77

(under subclass 75) Apparatus in which the working member is provided with the shallow recess or depression.