US PATENT SUBCLASS 244 / 30
.~ Airships

Current as of: June, 1999
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244 /   HD   AERONAUTICS

24  DF  AIRCRAFT, LIGHTER-THAN-AIR {7}
30.~ Airships

DEFINITION

Classification: 244/30

(under subclass 24) Propelled aeronautical machines sustained by their buoyancy relative to the air.

SEE OR SEARCH THIS CLASS, SUBCLASS:

61, for power plants for airships using some gas, used in the sustentation or operation of the craft, also as fuel.

94, for ballast storage and release.

95, for ballast making.

96+, for control devices and their arrangement, particularly adapted for use on airships.

125, 126, 127, and 128, for the construction of airships.