Coachman's box seat and aerosol can: what they have in common

1. Step 1. Coachman's box seat — is part of — Stagecoach. The coachman’s seat.
2. Step 2. Stagecoach — evolved from — Carriage. A public coach.
3. Step 3. Carriage — is made of — Leather. The suspension of early carriages was leather straps.
4. Step 4. Leather — is material for — Bellows. Bellows are a leather bag.
5. Step 5. Bellows — has part — Valve. A valve in the bellows lets air in when they open and keeps it from escaping back.
6. Step 6. Valve — is part of — Aerosol can. A valve.

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