Drilldown: Patents
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Patents > Inventors:
Frederic R. Engstrom 
& Filing date:
December 27, 1977
& Grant date:
September 1980
& Filing date:
December 27, 1977
& Grant date:
September 1980 Use the filters below to narrow your results.
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Showing below up to 1 result in range #1 to #1.