PHILLIPS, Circuit Judge.
Johns-Manville Corporation brought this suit against the National Tank Seal Company for infringement of Claim 1 of United States patent No. 1,184,673, granted to Charles C. Fardon on May 23, 1916, for improvement in storage tanks.
Claim 1 of the patent reads as follows:
"1. In a storage tank, a receptacle and a roof therefor, a sheathing covering the roof, a fabric engaging the sheathing and extending from the roof to the sides...
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