Which later refinement transformed the sewing machine from a purely utilitarian tool into a craft instrument?

Answer

The development of stitch variety like zig-zag and embroidery.

Subsequent advancements moved beyond the basic straight lockstitch to include features like zig-zag and embroidery stitches, expanding the machine's capability into crafting.

Which later refinement transformed the sewing machine from a purely utilitarian tool into a craft instrument?
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