US PATENT SUBCLASS 220 / 213
.~ Convex or concave closure conforms to curvature of opening to be closed

Current as of: June, 1999
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220 /   HD   RECEPTACLES

200  DF  CLOSURES {45}
213.~ Convex or concave closure conforms to curvature of opening to be closed

DEFINITION

Classification: 220/213

(under subclass 200) Devices wherein the closure is convex or concave in cross-section and closes an opening in a wall, such wall having the same or similar curvature in cross-section.