Drilldown: Patents
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Patents > Year filed:
1917
& Office
:
AT
or
CA
& Applicant firm:
None
& National tech categories:
AT 77d
& Number of text pages:
1-2 ![](/aero/extensions/Cargo/drilldown/resources/filter-x.png)
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Showing below up to 12 results in range #1 to #12.