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Patents > CPCs : CPC B61D41/00 or CPC B64C13/00 & Citations from after 1930: None

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None (282) · Patent US-1910-1055379 (3) · Patent US-1909-970771 (3) · Patent FR-1912-451312 (2) · Patent DE-1918-388537 (2) · Patent US-1909-1008096 (2) · Patent GB-1913-3848 (2)
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None (202) · Armengaud jeune (11) · Weismann et Marx (6) · Marks & Clerk (5) · Haseltine, Lake & Co. (5) · Munn & Co. (5) · Brandon frères (4) · Brierley & Howard (4) · Paul Blum (3) · Noyes & Harriman (3) · None (3) · Abel & Imray (3)
National tech categories:
None (131) · FR 6.4 (61) · DE 77h.5 (22) · USPC 244/233 (21) · USPC 244/90R (20) · USPC 244/78.1 (15) · USPC 244/87 (11) · USPC 244/225 (7) · USPC 244/88 (5) · USPC 244/234 (5) · USPC 244/82 (5) · USPC 244/232 (4) · USPC 244/237 (4) · USPC 244/80 (4)
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