Date: June 10, 1890
Creator: Ericson, John
Description: Patent for a new and improved screw. This design consists in "[a] screw, the body and shank of which are of corresponding diameter throughout their length, the shank terminating in a rounded end, and the shank and body being provided with a longitudinal straight channel extending throughout their lengths, one of the terminal shoulders of the channel being removed" (lines 4-10).
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