Vacuum pump oil and rocket: what they have in common

1. Step 1. Vacuum pump oil — is part of — Vacuum pump. It seals the gaps.
2. Step 2. Vacuum pump — evolved from — Piston pump. Guericke adapted the piston pump to pump out air.
3. Step 3. Piston pump — is part of — Concrete pump. A piston pump.
4. Step 4. Concrete pump — uses — Concrete. It pumps concrete.
5. Step 5. Concrete — is material for — Launch complex. The launch table is concrete.
6. Step 6. Launch complex — uses — Rocket. Launching rockets.

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