Tuning fork stem and tank: what they have in common

1. Step 1. Tuning fork stem — is part of — Tuning fork. A holder.
2. Step 2. Tuning fork — is part of — Quartz clock. Quartz shaped like a tuning fork at 32,768 Hz.
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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