Drilldown: Patents
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Patents > Office :
DE or
HU or
UN
& Filing date:
April 12, 1916
& National tech categories :
DE 77h.6 or
HU V/h
& IPCs :
IPC B64C11/02 or
IPC B64C25/00 or
IPC B64C3/54
& Citations from after 1930:
None
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Showing below up to 1 result in range #1 to #1.