USPC 244/30

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This subclass is indented under subclass 24. Propelled aeronautical machines sustained by their buoyancy relative to the air.

Enclosing categories USPC 244/24
Keywords LTA, Propulsion, USPC 244/61, USPC 244/94, USPC 244/95, USPC 244/96, USPC 244/125, USPC 244/126, USPC 244/127, USPC 244/128
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