Drilldown: Patents
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Patents > Office :
AH or
GB
& Inventor country :
BE or
None
& Grant date:
1920 - 1929
& CPCs :
CPC B64C13/00 or
CPC B64C3/385 or
CPC B64C39/00
Use the filters below to narrow your results.
Showing below up to 2 results in range #1 to #2.