Drilldown: Patents
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Patents > Office :
DE or
FR
& Grant date:
1919
& Granted:
Yes
& Related to aircraft :
.5 or
.5? or
1/2
& National tech categories :
DE 77h.5 or
FR 6.4
& Number of diagram pages:
1
Use the filters below to narrow your results.
Showing below up to 1 result in range #1 to #1.