Drilldown: Patents
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Patents > Filing date:
1970 - 1979 
& Grant date:
September 1980
& Cites :
Patent US 3629731A or
None
& Grant date:
September 1980
& Cites :
Patent US 3629731A or
None Use the filters below to narrow your results.
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Showing below up to 2 results in range #1 to #2.