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Patents > Year granted: 1912 & Number of figures: 3-20

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None (672) · Seine (17) · Paris (10) · London (4) · Nord (4) · New York (4) · Budapest (4) · St. Louis (3) · Michigan (3) · New York City (3) · Chicago (3) · Los Angeles (3) · England (3) · Bouches-du-Rhône (3) · New York state (3)
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National tech categories:
FR 6.4 (266) · None (155) · HU V/h (22) · DE 77h.5 (20) · AT 77d (18) · USPC 244/80 (15) · FR 6.2 (13) · USPC 244/45R (13) · USPC 244/35R (9) · USPC 244/22 (9) · RU Group V (9) · USPC 244/93 (8) · USPC 244/144 (7) · USPC 244/90R (7) · USPC 244/6 (7) · USPC 244/76R (6) · DE 77h.6 (6)
IPCs:
None (309) · IPC B64C17/00 (76) · IPC B64C39/00 (67) · IPC B64C1/00 (64) · IPC B64C25/00 (22) · IPC B64C3/00 (18) · IPC B64C11/00 (17) · IPC B64C3/38 (14) · IPC B64B1/00 (14) · IPC B64C3/56 (12) · IPC B64C33/02 (11) · IPC B64C11/16 (11) · IPC B64C23/00 (10) · IPC B64C17/06 (10) · IPC B64D17/00 (10) · IPC B64C35/00 (8) · IPC B64C13/00 (7) · IPC B64C3/54 (7) · IPC B64C27/04 (5)
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