Drilldown: Patents
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Patents > Year granted:
1905
& Office
:
??
or
CA
or
MX
or
NL
& Inventor country
:
AT
or
MX
or
RU
& Applicant type
:
Hermann Burkardt
or
INDIV
or
INDIV+COMPANY
& Grant date:
1909 ![](/aero/extensions/Cargo/drilldown/resources/filter-x.png)
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