Description: Patent for a new and improved roof screw. This design consists, "[a]s a new article of manufacture, [in] a screw consisting of a threaded shank having an integral head, an enlarged collar or flange on said shank below the head thereon, and an elastic cushion on the shank immediately below the enlarged collar or flange, for the purpose described" (lines 60-66).
Date: September 23, 1890
Creator: Corley, Daniel B.
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