Drilldown: Patents
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Patents > Office :
AU or
DE or
JP
& Inventor country :
AT or
Brazil or
RU
& Grant date:
1920 - 1929
& CPCs :
CPC B64C13/00 or
CPC B64C17/00 or
CPC B64C33/02
Use the filters below to narrow your results.
Showing below up to 3 results in range #1 to #3.