Intercontinental ballistic missile and lead–acid battery: what they have in common

1. Step 1. Intercontinental ballistic missile — has part — Gyroscope. Inertial navigation.
2. Step 2. Gyroscope — is part of — Torpedo. Obry’s gyroscope keeps the course.
3. Step 3. Torpedo — is part of — Submarine. Torpedo armament.
4. Step 4. Submarine — has part — Lead–acid battery. Underwater, electric motors run on batteries.

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