Drilldown: Patents
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Patents > Year granted:
1920 - 1929
& Inventor country
:
CH
or
HU
or
NL
& Applicant type
:
Hermann Burkardt
or
INDIV
& Granted:
Yes
& CPCs
:
CPC B64B1/40
or
CPC B64C23/005
or
None ![](/aero/extensions/Cargo/drilldown/resources/filter-x.png)
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Showing below up to 6 results in range #1 to #6.