Can opener and tank: what they have in common

1. Step 1. Can opener — has part — Gear. Roller openers.
2. Step 2. Gear — is part of — Transmission (gearbox). A gearbox is a set of gears.
3. Step 3. Transmission (gearbox) — is part of — Tank. The transmission carries torque to the drive sprockets and lets the tank turn.

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