BIGGS, Circuit Judge.
Genzo Shimadzu and another sued The Electric Storage Battery Company, alleging the infringement of six patents for the production of fine lead powder suitable for use upon the plates of storage batteries or for the manufacture of paint. The District Court held all of the claims of the patents in litigation valid and furthermore held claims 1 and 2 of Patent No. 1,584,149, claims 1 to 4, 6, and 8 to 13 of Patent No. 1,584,150 and claims 10 and...
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