Rubber hammer head and submarine: what they have in common

1. Step 1. Rubber hammer head — is part of — Reflex hammer. A soft striking part.
2. Step 2. Reflex hammer — is a kind of — Hammer. A hammer.
3. Step 3. Hammer — evolved into — Steam hammer. A steam hammer is a hammer lifted by steam, used to forge huge parts.
4. Step 4. Steam hammer — has part — Cylinder. A steam cylinder.
5. Step 5. Cylinder — is part of — Diesel engine. Cylinders.
6. Step 6. Diesel engine — is part of — Submarine. Diesel-electric submarines.

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