Drilldown: Patents
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Patents > Office
:
CH
or
FR
or
HU
or
SE
& Inventor country
:
AU
or
CH
or
DE
or
HU
or
None
& Publication date:
1911
& IPCs
:
IPC B64C3/00
or
IPC B64C39/00
& Citations from after 1930:
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