Drilldown: Patents
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Patents > Year filed:
1900 - 1909
& Applicant type :
1 or
INDIV
& Supplementary to patent:
Patent DE-1899-123884
& National tech categories :
DE 77 or
FR 6.3 or
USPC 244/153R
& IPCs :
IPC B64C17/00 or
IPC B64C23/00
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