Butter churn and hydraulic press: what they have in common

1. Step 1. Butter churn — uses — Lever. A dasher.
2. Step 2. Lever — is part of — Jack. The pump handle.
3. Step 3. Jack — has part — Hydraulic cylinder. A working cylinder.
4. Step 4. Hydraulic cylinder — is part of — Hydraulic press. Two cylinders of different diameters.

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