Drilldown: Patents
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Patents > Office:
US
& Filing date:
December 4, 1912
& National tech categories :
FR 6.4 or
USPC 244/89 or
USPC 244/90R
& CPCs :
CPC B64B1/58 or
CPC B64C2700/6295 or
CPC B64C35/00 or
CPC B64C39/00
& Family year:
1912
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