Monocoque and rock drill: what they have in common

1. Step 1. Monocoque — evolved from — Chassis frame. The body took over the role of the frame.
2. Step 2. Chassis frame — is part of — Truck. A body-on-frame design.
3. Step 3. Truck — has part — Air brake. Air brakes, as on trains.
4. Step 4. Air brake — uses — Compressed air. The brake is controlled by air pressure in the train pipe.
5. Step 5. Compressed air — is used in — Rock drill. Pneumatics.

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