Drilldown: Patents
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Patents > Office :
BE or
DE or
UN
& Grant date:
January 1921
& Publication date:
1921
& Supplementary to patent :
Patent DE-1914-330779 or
Patent FR-1911-430455
& National tech categories:
DE 77h.2
& Cites these patents:
None
& Number of diagram pages:
1
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