AUGUSTUS N. HAND, Circuit Judge.
The complainants are the legal and equitable owners of United States letters patent No. 1,520,936 to James H. Dennedy, granted December 30, 1924. The suit is for infringement, and the claims in issue are Nos. 3, 4, 5, and 7 to 13, inclusive.
The specification sets forth the alleged invention in general terms as follows:
"This invention relates to artificial refrigerating systems in which a refrigerant body such as sulphur...
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