Crane jib and aerosol can: what they have in common

1. Step 1. Crane jib — is part of — Portal crane. A slewing jib.
2. Step 2. Portal crane — has part — Wire rope. The load hangs on steel cables.
3. Step 3. Wire rope — is part of — Mine hoist. Mine ropes were the first use of wire rope.
4. Step 4. Mine hoist — has part — Watt steam engine. Steam winding engines.
5. Step 5. Watt steam engine — has part — Valve. A slide valve distributes the steam.
6. Step 6. Valve — is part of — Aerosol can. A valve.

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