US PATENT SUBCLASS 244 / 24
AIRCRAFT, LIGHTER-THAN-AIR

Current as of: June, 1999
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244 /   HD   AERONAUTICS

24AIRCRAFT, LIGHTER-THAN-AIR {7}
25  DF  .~> Airships with sustaining wings
26  DF  .~> Airship and helicopter sustained
27  DF  .~> Airship and paddle wheel sustained
28  DF  .~> Airship and beating wing sustained
29  DF  .~> Airship and fluid sustained
30  DF  .~> Airships
31  DF  .~> Balloons {2}

DEFINITION

Classification: 244/24

(under the class definition) Miscellaneous aircraft which ordinarily have a total weight less than or equal to that of the volume of air which they displace and are therefore sustained by their buoyancy with respect to the air.