Drilldown: Patents
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Patents > Office:
DE
& Grant date:
1890
& Granted:
Yes
& National tech categories :
DE 77 or
DE 77h.6
& CPCs :
CPC B64C23/005 or
CPC B64C2700/6235 or
CPC B64C2700/6295 or
None
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Showing below up to 3 results in range #1 to #3.