Drilldown: Patents
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Patents > Year granted:
1919
& Inventor country:
FR
& National tech categories :
FR 5 or
FR 6.3 or
FR 6.4 or
USPC 244/30
& Citations from after 1930:
1
& Number of text pages:
2-3
Use the filters below to narrow your results.
Showing below up to 1 result in range #1 to #1.