Staple cartridge and knife: what they have in common

1. Step 1. Staple cartridge — is part of — Surgical stapler. Rows of staples.
2. Step 2. Surgical stapler — evolved from — Surgical suture. Staples instead of thread.
3. Step 3. Surgical suture — uses — Needle. A surgical needle.
4. Step 4. Needle — is part of — Overlocker. Needles sew the stitch.
5. Step 5. Overlocker — has part — Knife. A knife for trimming the edge.

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