Patent classifications
B
PERFORMING OPERATIONS; TRANSPORTING
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B64
AIRCRAFT; AVIATION; COSMONAUTICS
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B64B
LIGHTER-THAN AIR AIRCRAFT
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B64B1/06
Rigid airships; Semi-rigid airships
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B64B1/24
Arrangement of propulsion plant
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B64B1/30
Arrangement of propellers
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B64B1/34
of lifting propellers
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