Drilldown: Patents
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Patents > Inventor country
:
BE
or
US
& Filing date:
1960 - 1969
& National tech categories
:
USPC 244/22
or
USPC 244/30
or
USPC 244/80
& IPCs:
None ![](/aero/extensions/Cargo/drilldown/resources/filter-x.png)
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Showing below up to 3 results in range #1 to #3.