Drilldown: Patents
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Patents > Year granted:
1911
& Office :
GR or
US
& National tech categories :
AT 77d or
BE K or
USPC 244/80
& First filing :
No or
Yes
& Number of claims:
5-8
Use the filters below to narrow your results.
Showing below up to 10 results in range #1 to #10.