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Patents > IPCs : B64C31/00 or IPC B64B1/00 & Citations from after 1930: None

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Tech fields:
LTA (317) · frame (80) · balloon (77) · propulsion (69) · navigation (68) · dirigible (50) · airship (49) · stability (37) · construction (36) · design (36) · dirigibles (31) · hybrid (31) · balloons (28) · safety (28) · rigid (27) · car (27) · propeller (25) · compartments (21) · ballonet (20)
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Supplementary to patent:
None (297) · Patent FR-1913-472867 (4) · Patent FR-1913-467415 (3) · Patent ES-1906-38692 (3) · Patent GB-1913-11207 (2) · Patent FR-1902-317598 (2) · Patent FR-1914-472867.19895 (2) · Patent FR-1907-382794 (2) · Patent CH-1909-48028 (2) · Patent IT-1913- (2) · Patent US-1913-1087946 (2) · Patent BE-1912-07-11 Maiche et Legras (2)
Related to aircraft:
Patent agent:
None (187) · Armengaud jeune (13) · None (11) · Borame et Julien (10) · Haseltine, Lake & Co. (9) · Brandon frères (8) · Chassevent (8) · Hippolyte Josse (7) · Munn & Co. (7) · Lavoix et Mosès (6) · C. Blétry (5) · G. Petiau (5) · Boult, Wade & Tennant (5) · de Bongé (4) · Ed. Wolf (4) · C. Baumann (4) · Marks & Clerk (4) · Dupont et Elluin (4)
National tech categories:
FR 6.4 (177) · FR 6.3 (50) · None (47) · USPC 244/30 (27) · USPC 244/26 (13) · DE 77h.2 (11) · USPC 244/25 (9) · DE 77 (7) · USPC 244/127 (7) · USPC 244/125 (6) · USPC 244/99 (5) · USPC 244/96 (5) · USPC 244/32 (5) · DE 77h (5) · USPC 244/29 (4) · USPC 244/67 (4) · USPC 24/713.8 (4)
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