Sewing machine shuttle and watt steam engine: what they have in common

1. Step 1. Sewing machine shuttle — is part of — Sewing machine. The shuttle forms the stitch.
2. Step 2. Sewing machine — has part — Cam. Cams drive the fabric feed.
3. Step 3. Cam — is part of — Power loom. Cams lift the heddles.
4. Step 4. Power loom — has part — Watt steam engine. Driven by a steam engine.

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