Drilldown: Patents
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Patents > Grant date:
1980 - 1989 
& Cites :
Patent US 3214631A or
Patent US 3312850A or
Patent US 3629731A
& Cites :
Patent US 3214631A or
Patent US 3312850A or
Patent US 3629731A Use the filters below to narrow your results.
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Showing below up to 2 results in range #1 to #2.