Space frame and radio: what they have in common

1. Step 1. Space frame — has part — Truss. Space trusses.
2. Step 2. Truss — is part of — Retractable roof. Trusses.
3. Step 3. Retractable roof — is part of — Stadium. A retractable roof.
4. Step 4. Stadium — has part — Public address system. Sound.
5. Step 5. Public address system — has part — Amplifier. Amplifiers.
6. Step 6. Amplifier — is part of — Radio. Amplifying a weak signal.

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