Drilldown: Patents
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Patents > Supplementary to patent:
Patent BE-1911-04-14 Lucien-Constant-Joseph Harel
& National tech categories :
FR 6.4 or
GB 4 propel & steer or
USPC 244/45R or
None
& IPCs:
IPC B64C3/00
& Family year:
1911
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