Drilldown: Patents
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Patents > National tech categories
:
AT 77d
or
USPC 244/66
or
USPC 244/80
& IPCs
:
IPC B64C23/00
or
IPC B64C25/00
& CPCs
:
CPC B64C2700/6212
or
CPC B64C2700/6274
or
CPC B64C35/00 ![](/aero/extensions/Cargo/drilldown/resources/filter-x.png)
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