Drilldown: Patents
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Patents > National tech categories 
:
USPC 244/153R or
USPC 244/30 or
USPC 244/80
& First filing:
Yes
& Number of text pages:
2-3
:
USPC 244/153R or
USPC 244/30 or
USPC 244/80
& First filing:
Yes
& Number of text pages:
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- Patent US-1922-1430393
