US PATENT SUBCLASS 244 / 12.2
.~.~ Circular

Current as of: June, 1999
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244 /   HD   AERONAUTICS

4 R  DF  AIRCRAFT, HEAVIER-THAN-AIR {14}
12.1  DF  .~ Airplane and fluid sustained {5}
12.2.~.~ Circular

DEFINITION

Classification: 244/12.2

Circular:

(under subclass 12.1) Apparatus wherein the peripheral surface of either the aeronautical machine or the airfoil therefor is substantially in the form of a circle.