PER CURIAM.
This is an appeal from a decree adjudging invalid claims 9 and 11 to 15 of Reissue Patent No. 17,817 granted to appellant, as assignee of Edwin A. Jones, the inventor. The patent relates to a gas furnace consisting of a metal casing within which there is a heating unit so constructed as to form a series of serpentine flues between the walls thereof, a box-like extension opening in the front portion of the unit projecting outwardly through the metal casing...
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