Drilldown: Patents
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Patents > Year granted:
1919
& Office :
DK or
FR
& Applicant firm:
None
& IPCs :
IPC B64C13/00 or
IPC B64C27/04 or
IPC B64C3/00
& Citations from after 1930:
None
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21048D (1) ·
491705D (1) ·
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497275D (1)
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