FOSTER, Circuit Judge.
This is an appeal from an interlocutory decree holding patent No. 1,517,928, issued to John B. Welch, December 2, 1924, for improvements in kilns for drying lumber, to be valid and infringed.
The record supports the following conclusions as to the material facts. After sawing, green lumber must be dried before using it. One method of drying is by the use of what are known as progressive kilns. These kilns are buildings varying in length...
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