prov:value
| - For example, such plates are described as to preparation, composition, thickness and other parameters, in US. Pat. 2,745,327 to Mengali; US. Pat. 2,803,541 to Paris; US. Pat. 2,803,542 to Ullrich, IL; US. Pat. 2,863,- 768 to Schaffert; US. Pat. 2,901,348 to Dessauer et al.; US. Pat. 2,901,349 to Clark etc., which are incorporated herein by reference.
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