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Patents > Assigned to: None & Citations from after 1930: None & Number of text pages: 5-10

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Inventor country:
US (256) · GB (178) · FR (157) · DE (54) · AT (20) · CA (20) · IT (19) · HU (13) · None (13) · RU (13) · BE (12) · AU (12) · RO (10) · NZ (7) · VN (7) · IE (6) · NL (5) · AH (4) · IN (3)
Inventor location:
None (689) · Budapest (7) · England (5) · Massachusetts (5) · Bexar county (5) · New York state (4) · London (4) · Morbihan (4) · Nord (4) · Pennsylvania (4) · San Antonio (4) · TX (4) · Chicago (4)
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National tech categories:
None (344) · FR 6.4 (190) · HU V/h (34) · FR 6.3 (11) · CH 129b (11) · USPC 244/80 (9) · GB 4 propel & steer (9) · AU 90.3 (8) · USPC 244/30 (6) · AT 77d (6) · USPC 244/233 (6) · GB 4 without buoyant (5) · DK 77 (5) · USPC 244/35R (5) · USPC 244/64 (5) · AU 90.5 (4) · USPC 244/11 (4) · USPC 244/76R (4) · GB 4 framework (4)
IPCs:
None (341) · IPC B64C17/00 (86) · IPC B64C1/00 (75) · IPC B64C39/00 (54) · IPC B64B1/00 (22) · IPC B64C3/38 (21) · IPC B64C33/02 (16) · IPC B64C17/06 (15) · IPC B64C11/00 (15) · IPC B64C33/00 (15) · IPC B64C35/00 (14) · IPC B64C27/04 (11) · IPC B64C13/00 (9) · IPC B64C3/00 (8) · IPC B64C23/00 (8) · IPC B64C3/52 (6) · IPC B64D17/00 (6) · IPC B64B1/40 (6)
CPCs:
None (215) · CPC B64C17/00 (101) · CPC B64C2700/6218 (45) · CPC B64C39/00 (39) · CPC B64B1/00 (35) · CPC B64C13/00 (29) · CPC B64C2700/6295 (26) · CPC B64C3/385 (23) · CPC B64C2700/6212 (22) · CPC B64C33/02 (21) · CPC B64C33/00 (18) · CPC B64C23/005 (17) · CPC B64C17/06 (16) · CPC B64C35/00 (13) · CPC B64C39/005 (12) · CPC B64C2700/6281 (9) · CPC B64C3/00 (9)
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Citations from after 1930:
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