OPINION
ALDRICH, Senior Circuit Judge.
This is an action brought for the infringement of two patents for metering and mixing plastic ingredients, Tschritter, No. 3,814,296, June 4, 1974, and Jakob, No. 3,985,345, Oct. 12, 1976, by the owner, Colortronic Reinhard Co., K.G., (Colortronic), a German limited partnership of which one
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