Drilldown: Patents
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Patents > Office
:
FR
or
MX
& Grant date:
1912
& CPCs
:
CPC B64B1/40
or
CPC B64C2700/6212
or
CPC B64C2700/6235
or
CPC B64C3/385
or
CPC B64C39/005
& Family year:
1909
& Number of text pages:
3-7 ![](/aero/extensions/Cargo/drilldown/resources/filter-x.png)
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