Plaintiffs Andrus and Gelbman are co-owners of patents No. 2,275,676 (1942) and 2,366,780 (1945). The first is an apparatus, and the second a method patent for the manufacture of concrete building blocks. Plaintiff, Besser Manufacturing Co., licensee under both Andrus-Gelbman patents, is the owner of apparatus patent No. 2,106,329 (1938), known and referred to herein as the Scott patent. There are...
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