BODINE, District Judge.
The case involves United States letters patent No. 1,220,444, issued to Samuel Naismith, of Chicago. The following excerpts from the specification disclose the invention (the italics are mine):
"My invention relates more particularly to basic open hearth and reheating furnaces used for metallurgical purposes, and has for its object a new and useful improvement for the preservation of the slag line and means for supporting the furnace...
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