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Patents > Year granted: 1920 & Office: DE & Citations from after 1930: None

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Tech fields:
airplane (20) · frame (12) · None (10) · wings (9) · fuselage (6) · design (6) · construction (6) · propeller (6) · subsystem (5) · metal (4) · navigation (4) · LTA (4) · stability (4) · biplane (4) · airfoil (4)
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None (22)
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CPCs:
CPC B64C3/00 (9) · None (7) · CPC B64C35/00 (7) · CPC B64C17/00 (7) · CPC B64C1/12 (4) · CPC B64C13/00 (3) · CPC B64F2700/6261 (3) · CPC B64C3/26 (3) · CPC B64C2700/6235 (3) · CPC B64C2700/6233 (3) · CPC B64C2700/6212 (3) · CPC B64C2700/6256 (2) · CPC B64C25/62 (2) · CPC B64C11/04 (2) · CPC B64C11/00 (2) · CPC B64C2001/0063 (2) · CPC B64B1/58 (2) · CPC B64C2700/6218 (2) · CPC B64F2700/6226 (2) · CPC B64C3/385 (2)
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Cites these patents:
Citations from after 1930:
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