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What improvement did Walter Hunt and Elias Howe make to sewing machines?

Walter Hunt and Elias Howe improved sewing machines independently from one another. Both designs used a curved eye-pointed needle that interlocked two threads though the fabric, which created a stronger stitch. Although Hunt’s innovation came earlier in about 1832–34, he never patented his design. Howe, however, patented his design in 1846.