Drilldown: Patents
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Patents > Supplementary to patent:
Patent CH-1899-18666 
& National tech categories :
GB 4 propel & steer or
USPC 244/64
& National tech categories :
GB 4 propel & steer or
USPC 244/64 Use the filters below to narrow your results.
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balloon (1) ·
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frame (1) ·
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rudder (1) ·
takeoff (1)
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