Which inventor focused primarily on making the sewing machine commercially viable and user-friendly after the lockstitch was established?

Answer

Isaac Merritt Singer

Isaac Singer, securing his patent in 1851, built upon the existing foundation by focusing on user experience, speed, reliability, and market penetration, rather than inventing the lockstitch itself.

Which inventor focused primarily on making the sewing machine commercially viable and user-friendly after the lockstitch was established?
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