Drilldown: Patents
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Patents > Office
:
CA
or
DEG
or
US
or
Other
& Publication date:
1900 - 1999
& National tech categories:
AT 77d
& Citations from after 1930:
None
& Number of claims:
5-50000000
& Number of figures:
10-30 ![](/aero/extensions/Cargo/drilldown/resources/filter-x.png)
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Use the filters below to narrow your results.
Aerodynamics (1) ·
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construction (1) ·
Design (1) ·
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flapping (2) ·
frame (1) ·
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Helicopter (2) ·
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Propulsion (3) ·
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Showing below up to 8 results in range #1 to #8.