Drilldown: Patents
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Patents > Supplementary to patent :
1913-01-23 or
Patent GB-1911-29012
& Related to aircraft :
Yes or
yes, Jul 6 1908
& CPCs :
CPC B64C23/005 or
CPC B64C2700/6218
& Family year:
1910 - 1919
& First filing:
Yes
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