Drilldown: Patents
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Patents > Inventor country
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CA
or
DK
or
IT
or
NL
& Full specification filed date:
December 31, 1969
& Grant date:
1960 - 1969
& Publication date:
1900 - 1999
& Citations from after 1930:
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Showing below up to 2 results in range #1 to #2.