Ballast tank and needle: what they have in common

1. Step 1. Ballast tank — uses — Compressed air. The tanks are blown with compressed air.
2. Step 2. Compressed air — is used in — Jackhammer. Compressed air.
3. Step 3. Jackhammer — has part — Piston. A percussion piston.
4. Step 4. Piston — is part of — Syringe. A plunger.
5. Step 5. Syringe — has part — Needle. A hollow needle.

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