Touch hole and refrigerator: what they have in common

1. Step 1. Touch hole — is part of — Cannon. Igniting the charge.
2. Step 2. Cannon — includes — Tank gun. A gun.
3. Step 3. Tank gun — is part of — Tank. A gun in a rotating turret.
4. Step 4. Tank — has part — Gas turbine. Some tanks (T-80, Abrams) have a gas turbine engine.
5. Step 5. Gas turbine — has part — Compressor. A compressor.
6. Step 6. Compressor — is part of — Refrigerator. A compressor with an electric motor.

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