Drilldown: Patents
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Patents > Grant date:
1884
& National tech categories :
DE 77 or
DE 77h or
IT 8 or
USPC 244/30 or
USPC 244/45R
& CPCs :
CPC B64C23/005 or
CPC B64C3/385
Use the filters below to narrow your results.
Showing below up to 2 results in range #1 to #2.