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Patents > Applicant firm: None & Citations from after 1930: None & Number of figures: 9-40

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Inventor country:
US (253) · FR (239) · GB (145) · DE (93) · AT (31) · AU (28) · BE (26) · IT (22) · RU (16) · HU (15) · CH (15) · None (14) · AH (7) · ES (6) · CA (6) · MC (4) · IE (4)
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National tech categories:
None (271) · FR 6.4 (271) · HU V/h (46) · DE 77 (25) · AT 77d (15) · FR 6.3 (15) · CH 129b (14) · RU Group V (12) · AU 90.3 (12) · FR 6.2 (11) · USPC 244/80 (11) · USPC 244/233 (8) · AU 90.5 (8) · GB 4 propel & steer (8) · USPC 244/22 (8) · DK 77 (7) · DE 77h.7 (6) · USPC 244/28 (6) · DE 77h.5 (6)
IPCs:
None (384) · IPC B64C17/00 (72) · IPC B64C39/00 (68) · IPC B64C1/00 (65) · IPC B64C33/02 (34) · IPC B64B1/00 (27) · IPC B64C23/00 (21) · IPC B64C3/38 (18) · IPC B64C11/00 (18) · IPC B64C3/00 (17) · IPC B64C3/18 (14) · IPC B64C33/00 (14) · IPC B64C13/00 (13) · IPC B64C17/06 (13) · IPC B64C27/04 (11) · IPC B64C3/56 (9) · IPC B64C1/06 (9) · IPC B64C3/52 (8) · IPC B64C35/00 (8)
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Citations from after 1930:

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