Oil well and electric motor: what they have in common

1. Step 1. Oil well — uses — Drilling rig. A well is drilled by a rig.
2. Step 2. Drilling rig — has part — Block and tackle. The block and tackle lifts the drill string.
3. Step 3. Block and tackle — is part of — Tower crane. The load is lifted with a block and tackle.
4. Step 4. Tower crane — has part — Electric motor. An electric motor turns the winch.

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