Drilldown: Patents

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Patents > Office : CU or FR & Applicant firm: None & Filing date: 1910 - 1919 & National tech categories : FR 20 or USPC 244/153R or USPC 244/3.23 or USPC 244/30 or None & First filing: No

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CPCs:
CPC B64C39/00 (92) · CPC B64C2700/6295 (86) · CPC B64C17/00 (72) · CPC B64C23/005 (43) · CPC B64C2700/6274 (35) · CPC B64C3/385 (35) · CPC B64C33/02 (29) · CPC B64C35/00 (23) · CPC B64C2700/6212 (22) · CPC B64C3/00 (19) · CPC B64C1/00 (19) · CPC B64C13/00 (18) · CPC B64C2700/6218 (18) · CPC B64C2700/6219 (17) · CPC B64C2700/6256 (15) · None (14) · CPC B64C2700/6214 (13) · CPC B64C2700/6228 (13) · CPC B64C39/005 (12) · CPC B64C11/006 (12)
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