OPINION
EDELSTEIN, District Judge.
This action was commenced on November 21, 1966, by plaintiff Gretener, A.G., a Swiss company, filing a declaratory judgment action against defendant Dyson-Kissner Corporation seeking a declaration of non-infringement and invalidity of six patents owned by Dyson-Kissner. On March 29, 1967, a summons and complaint in intervention was served upon defendant by plaintiffs-interveners, Maschinenfabrik Rieter, A.G., a Swiss company...
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