Drilling rig and laser: what they have in common

1. Step 1. Drilling rig — has part — Diesel engine. The drive.
2. Step 2. Diesel engine — is part of — Submarine. Diesel-electric submarines.
3. Step 3. Submarine — has part — Periscope. A periscope.
4. Step 4. Periscope — has part — Mirror. Mirrors or prisms.
5. Step 5. Mirror — is part of — Laser. A resonator made of mirrors.

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