Radio and paper machine: what they have in common

1. Step 1. Radio — includes — Transistor radio. A radio receiver.
2. Step 2. Transistor radio — has part — Loudspeaker. A loudspeaker.
3. Step 3. Loudspeaker — is made of — Paper. The cone is paper.
4. Step 4. Paper — uses — Paper machine. Industrial production.

Open Evothings