MR. JUSTICE FRANKFURTER delivered the opinion of the Court.
The C-O-Two Fire Equipment Company, the respondent here, owns two patents, one issued on November 23, 1948, and the other reissued on August 23, 1949, for squeeze-grip valves and discharge heads for portable fire extinguishers. C-O-Two, incorporated in Delaware, has offices in Newark, New Jersey. On January 17, 1950, it commenced in the District Court for the Northern District of Illinois an action against...
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