Drilldown: Patents
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Patents > Office :
IT or
NZ or
RU or
US
& Filing date:
1914
& National tech categories :
IT 8 or
USPC 244/153R or
USPC 244/22 or
USPC 244/80
& Family year:
1910 - 1919
& Cites these patents :
Patent US-1903-821393 or
None
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