Mop head and piston pump: what they have in common

1. Step 1. Mop head — is part of — Mop. A rag or microfibre head.
2. Step 2. Mop — has part — Handle. A long stick.
3. Step 3. Handle — is part of — Hammer. A handle.
4. Step 4. Hammer — evolved into — Steam hammer. A steam hammer is a hammer lifted by steam, used to forge huge parts.
5. Step 5. Steam hammer — has part — Cylinder. A steam cylinder.
6. Step 6. Cylinder — is part of — Piston pump. The piston moves in a cylinder.

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