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Patents > Year granted: 1918 & National tech categories : USPC 244/30 or None

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Tech fields:
None (278) · Airplane (17) · frame (15) · construction (15) · wings (11) · LTA (11) · stability (10) · design (9) · propulsion (8) · fuselage (7) · hybrid (7) · propeller (6) · propellers (6) · balloon (5) · structure (5) · helicopter (5)
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None (272) · None (6) · John P. Tarbox (4) · Randolph, Jr. (4) · Marks & Clerk (3) · Mewburn, Ellis & Pryor (3) · Brewer & Son (3) · J. S. Withers & Spooner (3) · C. A. Snow & Co. (2) · John Liddle (2) · Haseltine, Lake & Co. (2) · Watson E. Coleman (2) · Lewis William Goold (2) · A. M. & William Clark (2)
National tech categories: (Click arrow to add another value)
CPCs:
CPC B64C2700/6295 (31) · CPC B64B1/00 (21) · CPC B64C3/00 (19) · CPC B64C13/00 (16) · CPC B64C35/00 (15) · CPC B64C17/00 (14) · CPC B64C23/005 (13) · CPC B64C2700/6235 (12) · CPC B64C3/18 (12) · CPC B64C39/00 (10) · CPC B64C3/385 (9) · CPC B64C3/185 (9) · CPC B64C25/60 (9) · CPC B64C39/005 (8) · CPC B64C33/02 (8) · None (8) · CPC B64B1/40 (8) · CPC B64C2001/0081 (7) · CPC B64C3/14 (7)
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