US PATENT SUBCLASS 110 / 335
.~ Concave surface area


Current as of: June, 1999
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110 /   HD   FURNACES

331  DF  ARCH OR ROOF STRUCTURE {2}
335.~ Concave surface area


DEFINITION

Classification: 110/335

Concave surface area:

(under subclass 331) Structure wherein the arch has an inwardly curved contour.

SEE OR SEARCH CLASS

52, Static Structures (e.g., Buildings),

86+, 245, and 639+ for curved roof construction of general application.