Drilldown: Patents
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Patents > Filing date:
August 1977
& Grant date:
1980 - 1989
& Cites :
Patent US 3293474A or
Patent US 3312850A or
Patent US 3325673A or
Patent US 3531675A or
Patent US 3689752A or
None
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Showing below up to 1 result in range #1 to #1.