Galvanometer and paper machine: what they have in common

1. Step 1. Galvanometer — has part — Permanent magnet. A magnet.
2. Step 2. Permanent magnet — is part of — Loudspeaker. A permanent magnet.
3. Step 3. Loudspeaker — is made of — Paper. The cone is paper.
4. Step 4. Paper — uses — Paper machine. Industrial production.

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