US PATENT SUBCLASS 418 / 79
.~ Radial groove

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}
79.~ Radial groove

DEFINITION

Classification: 418/79

(under subclass 75) Apparatus in which the shallow recess or depression has parallel sides or edges parallel to a radial line therebetween extending from the axis of rotation of the working member.