Atom detector and tank: what they have in common

1. Step 1. Atom detector — is part of — Atomic clock. It records the transitions.
2. Step 2. Atomic clock — evolved from — Quartz clock. The quartz oscillator is tuned to an atomic standard.
3. Step 3. Quartz clock — evolved from — Pendulum clock. Quartz replaced the pendulum as the frequency standard.
4. Step 4. Pendulum clock — has part — Gear. A wheel train.
5. Step 5. Gear — is part of — Transmission (gearbox). A gearbox is a set of gears.
6. Step 6. Transmission (gearbox) — is part of — Tank. The transmission carries torque to the drive sprockets and lets the tank turn.

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